UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.     )

Filed by the Registrant  ☒

Filed by a Party other than the Registrant  ☐

Check the appropriate box:

Gran Tierra Energy Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box)all boxes that apply):

TO OUR STOCKHOLDERS,

We invite you to attend the Annual Meeting of Gran Tierra Energy Inc., (“Gran Tierra” or the “Company”) which will be on May 5, 20214, 2022, at 1:30 p.m.11:00 a.m. Mountain Time. This year’s Annual Meeting will be a virtual meeting of stockholders, which will be conducted via live webcast. You will be able to attend the Annual Meeting of Stockholders online, vote your shares electronically and submit your questions during the meeting by visiting www.meetingcenter.io/296994452.https://web.lumiagm.com/244491258.

The attached Notice of Annual Meeting of Stockholders and Proxy Statement describes the business to be conducted at the Annual Meeting. Whether or not you plan to attend the Annual Meeting of Stockholders, we urge you to submit your vote via the internet telephone or mail.

I encourage you to read our 20202021 Annual Report and Sustainability Report for additional information about Gran Tierra’s operatingobjectives and financial results in 2020. Our teams in Colombia, Ecuador and Canada rose to meet2021. After the many challenges in 2020 that the world faced, 2021 was a year of 2020strong recovery for the energy industry and Gran Tierra. Our top tier, low-decline, onshore, conventional asset base continued to prove its high quality as the Company returned to strong growth in 2021 in terms of oil production, reserves, funds flow from operations, free cash flowand after-tax net asset value (“NAV”) per share. We achieved strong oil reserve replacement driven by our successful, on-budget development programs and waterflood initiatives.

During the challenging pandemic, we optimized our cost structure and have maintained those benefits through their diligent management2021. Continued reserves growth through optimization and increases in free cashflow (“FCF”) are a testament to our high-quality assets combined with development infrastructure investments made in 2017-2019 that are providing benefits to shareholders. The Company’s 2021 net income of $42 million was the highest achieved since 2018 and funds flow from operations reached $186 million, the highest since 2019, and an increase of 312% from $45 million in 2020. We also generated $37 million of free cash flow, the highest generated since 2012.

We saw tremendous results resuming production with a 2021 average working interest production of 26,507 barrels (“bbl”) of oil per day (“BOPD”), a 17% increase from 2020. The increase in production was the direct result of the development of key assets with successful drilling and workover campaigns in the Acordionero and Costayaco fields, combined with ongoing waterflood optimization throughout the Company’s portfolio. The successful drilling and workover campaigns also resulted in material Proved reserves additions, particularly in the Company’s core assets. The Proved Developed Producing (“PDP”) reserves replacement ratio was 148%, with PDP reserves additions of 14.3 million bbl of oil equivalent (MMBOE), while the Total Proved (“1P”) reserves replacement ratio was 123%, with 1P reserves additions of 11.9 MMBOE. The Company’s strong 1P reserves replacement resulted in 1P reserves of 81 MMBOE (100% oil) as of COVID-19year-end safety protocols2021. Finally, we strengthened our balance sheet by paying down debt which had been used to acquire assets and sharp focus on maintaininginstall infrastructure to efficiently and increasingeffectively optimize the value of our assets. Throughout

Looking to 2022, we are very excited for our planned development drilling programs in the courseMiddle Magdalena Valley and Putumayo Basins in Colombia, and the restart of our exploration drilling program, which we expect to include our first exploration wells in the Oriente basin in Ecuador. In addition to growth through our existing assets in Colombia and Ecuador, we continue to look at opportunities in other select basins to diversify and enhance the Company’s future potential for the coming decades. These activities, combined with a more constructive oil price environment, are expected to allow Gran Tierra to continue to resume growth through ongoing development of our existing assets and potential exploration discoveries. Furthermore, in the Company’s high case for 2022 guidance, which assumes a Brent oil price of $80/bbl, we forecast that Gran Tierra could generate $100-120 million of 2022 free cash flow, which would allow us to completely pay down our bank credit facility before the end of the first half of 2020,2022.

Finally, our Environmental, Social and Governance (ESG) focus continues which we took quick decisive action to protect our balance sheet by deferring our capital program, reducing our well workover activities, implementing cost saving initiatives, and shutting in higher-cost, lower-production minor fields, all while preserving the long-term value of our asset base.

During the second half of 2020, we realized and solidified our many cost saving initiatives, while cautiously planning a restart of our workovers and minor fields, as well as our development drilling program which commenced during the fourth quarter of 2020. Our key objective during the second half of 2020 was restarting our workover and drilling operations to economically rebuild production to achieve strong 2020 reserves replacement. With our workover and drilling campaigns charging ahead, production growing, and a new lower cost structure in place, we believe we have successfully positioned the Company to thrive in 2021 and beyond.

As difficult as 2020 was, Gran Tierra never faltered in its commitment to the health and safety of our people and all of our stakeholders. As a result, we achieved our best safety year on record with a Lost Time Incident frequency of zero during 2020. Suspending and restarting oil fields, drilling and workover operations and construction projects are the highest risk activities that we face in the industry and our team did an excellent job. Health and safety will continue to be a focus in 2021 through our industry-leading COVID-19 safety practices and protocols. In addition, our ‘Beyond Compliance Policy’ continues.“Beyond Compliance” philosophy. Where Gran Tierra identifies significant opportunities and benefits to the environment and communities, we voluntarily strive to go beyond what is legally required to protect the environment and provide social benefits, because it is the right thing to dodo. In 2021, for the first time GTE reported Scope 2 greenhouse gas (“GHG”) emissions (indirect operations from external power sources), in addition to Scope 1 GHG emissions, in the Company’s yearly GHG emissions report. Our 2020 results saw an overall GHG emissions reduction in excess of 60% relative to 2019 and were achieved via the Company’s gas-to-power projects and additional operational efficiencies. Gran Tierra is also focused on nature-based solutions to emissions and have planted a total of 1,193,321 trees and have conserved, preserved or reforested 2,805 hectares of land through all our environmental efforts since 2018.

Shareholders who have any questions should contact the Company’s strategic shareholder advisor and proxy solicitation agent, Kingsdale Advisors, at 1-855-476-7987 (toll-free within North America) or 1-416-867-2272 (collect call outside North America) or by e-mail at contactus@kingsdaleadvisors.com.

On behalf of our Board of Directors and the team at Gran Tierra, I want to thank all of our stakeholders for their continued support.

Sincerely,

		/s/ Gary S. Guidry   Gary S. Guidry President and Chief Executive Officer

March 25, 20212022

Notice of Meeting

Annual Meeting of the Stockholders of Gran Tierra Energy Inc.

The business of the meeting is to:

These items of business are more fully described in the proxy statement accompanying this notice.

This notice and the attached proxy statement are first being mailed to our stockholders beginning on March 25, 2021.2022. Holders of shares on March 9, 2021,8, 2022, the record date, are entitled to notice of, and to vote at, our meeting or any adjournment thereof.

In light of the COVID-19 pandemic and to mitigate the risks to the health and safety of our community, stockholders and employees, Gran Tierra will be holding its annual meeting in a virtual-only format by way of webcast accessed at www.meetingcenter.io/296994452https://web.lumiagm.com/244491258 and no physical or in-person meeting will be held. A virtual-only meeting will provide all stockholders an equal opportunity to participate at the annual meeting regardless of their geographic location or the particular constraints, circumstances or risks they may be facing as a result of COVID-19. Stockholders will be able to attend the Annual Meeting of Stockholders online and vote their shares electronically and submit questions during the meeting.

If you are a registered stockholder, to attend the Annual Meeting and vote your shares electronically and submit questions during the meeting, you will need the control number included on the Notice of Internet Availability of Proxy Materials or proxy card that accompanied your proxy materials. If you are the beneficial owner of shares held in “street name”, you must request and obtain a valid proxy from your broker or other agent in order to attend the Annual Meeting and vote your shares electronically and submit questions during the meeting.

We are using the “Notice and Access” method of providing proxy materials to our stockholders which provides our stockholders with a convenient way to access the proxy materials and vote, while allowing us to lower the costs of printing and distributing the proxy materials and reduce the environmental impact of our meeting. We will mail to most of our stockholders a Notice of Internet Availability of Proxy Materials (the “Notice”) in lieu of a paper copy of our proxy materials. Stockholders receiving the Notice may review the proxy materials online or request a paper copy by following the instructions set forth in the Notice.

Please submit your proxy or voting instructions on the Internet or by telephone promptly by following the instructions about how to view the proxy materials on your Notice of Internet Availability of Proxy Materials so that your shares can be voted, regardless of whether you expect to attend the annual meeting. If you received your proxy materials by mail, you may submit your proxy or voting

instructions on the Internet or by telephone, or you may submit your proxy by marking, dating, signing and returning the enclosed proxy/confidential voting instruction card. If you attend the annual meeting, you may withdraw your proxy and vote in person.

Shareholders who have any questions should contact the Company’s strategic shareholder advisor and proxy solicitation agent, Kingsdale Advisors, at 1-855-476-7987 (toll-free within North America) or 1-416-867-2272 (collect call outside North America) or by e-mail at contactus@kingsdaleadvisors.com.

By order of the Board of Directors

Calgary, Alberta, Canada

March 25, 20212022

Proxy Statement Table of Contents

PROXY STATEMENT SUMMARY

PROXY STATEMENT SUMMARY

Questions and Answers About the Proxy Materials and 20212022 Annual Meeting

Why am I receiving these materials?

We are sending you these proxy materials because the Board of Directors (the “Board”) of Gran Tierra Energy Inc., a Delaware corporation (“Gran Tierra” or the “Company”), is soliciting your proxy to vote at the 20212022 annual meeting of stockholders, including at any adjournments or postponements of the annual meeting. You are invited to attend the annual meeting, which is being held in a virtual-only format by way of webcast accessed at www.meetingcenter.io/296994452,https://web.lumiagm.com/244491258, to vote on the proposals described in this proxy statement. However, you do not need to attend the annual meeting to vote your shares. Instead, if you are a stockholder of record of our common stock, you may simply complete, sign and return the proxy card if you received a paper copy of our proxy materials, or follow the instructions below to submit your proxy over the telephone or through the internet. See “How do I vote” below for further information on how to vote, including if you hold our common stock through a broker in “street name” or hold exchangeable shares.

Pursuant to rules adopted by the Securities and Exchange Commission (the “SEC”), we have elected to provide access to our proxy materials over the internet. We are sending to our stockholders of record the proxy materials, including this proxy statement and an annual report, or a Notice Regarding the Availability of Proxy Materials (the “Notice”). We intend that our stockholders who hold their stock in “street name” will receive a Notice from their broker, bank or other agent in which they hold the stock in “street name,” unless they have specified otherwise. All stockholders will have the ability to access the proxy materials on the website referred to in the Notice or request to receive a printed set of the proxy materials. Instructions on how to access the proxy materials over the internet or to request a printed copy may be found in the Notice.

We intend to mail the proxy materials and Notice beginning on March 25, 2021,2022 to all stockholders of record entitled to vote at the annual meeting. We expect that the Notice will be sent to stockholders who hold their stock in “street name” on or about this same date.

How do I attend the annual meeting?

The annual meeting will be held on Wednesday, May 5, 2021,4, 2022, at 1:30 p.m.11:00 a.m. (Mountain time) and will be held solely by remote communication, in a virtual-only format.

Instructions to Attend Online Meeting

How can I request technical assistance during the virtual annual meeting?

If you encounter any difficulties accessing the virtual meeting during the check-in or during the meeting, please call the technical support number accessed by clicking “Additional Information” on the log-in page at www.meetingcenter.io/296994452.

Who can vote at the annual meeting?

Only stockholders of record at the close of business on March 9, 2021,8, 2022, will be entitled to vote at the annual meeting. On this record date, there were 366,981,556367,692,131 shares of common stock outstanding and entitled to vote.

A list of stockholders of record will be made available to participants who join the annual meeting as a “Shareholder” at www.meetingcenter.io/296994452.https://web.lumiagm.com/244491258.

Stockholders of Record: Shares Registered in Your Name

If at the close of business on March 9, 2021,8, 2022, your shares were registered directly in your name with Gran Tierra’s transfer agent, Computershare Investor Services,Odyssey Trust Company, then you are a stockholder of record. Registered stockholders will receive a proxy form containing the relevant details concerning the business of the meeting, including a control number required to access the virtual annual meeting.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 20212022 ANNUAL MEETING

Whether or not you plan to attend the annual meeting, we urge you to fill out and return the proxy or vote by proxy by telephone or on the internet as instructed below to ensure your vote is counted.

Beneficial Owner: Shares Registered in the Name of a Broker or Bank

If at the close of business on March 9, 2021,8, 2022, your shares were held, not in your name, but rather in an account at a brokerage firm, bank, dealer, or other similar organization, then you are the beneficial owner of shares held in “street name” and the Notice, and/or these proxy materials if you have received them, are being forwarded to you by that organization. The organization holding your account is considered to be the stockholder of record for purposes of voting at the annual meeting. As a beneficial owner, you have the right to direct your broker or other agent regarding how to vote the shares in your account. You are also invited to attend the annual meeting. However, since you are not the stockholder of record, you may not vote your shares electronically or submit questions at the annual meeting unless you request and obtain a valid proxy from your broker or other agent. See “How Do I Vote? - Beneficial Owner: Shares Registered in the Name of Broker or Bank” below for additional information about attending and participating in the Annual Meeting.

What am I voting on?

There are fourfive matters scheduled for a vote:

What if another matter is properly brought before the annual meeting?

The Board knows of no other matters that will be presented for consideration at the annual meeting. If any other matters are properly brought before the annual meeting, it is the intention of the persons named in the accompanying proxy to vote on those matters in accordance with their best judgment.

Will I be able to submit questions during the virtual annual meeting?

Stockholders will be able to submit questions through the virtual meeting website. Questions pertinent to meeting matters that comply with the meeting rules of conduct will be answered during the meeting, subject to time constraints. However, we reserve the right to exclude questions that are not pertinent to meeting matters, irrelevant to the business of the Company, derogatory or in bad taste, or relate to pending or threatened litigation, personal grievances or are otherwise inappropriate. Questions that are substantially similar may be grouped and answered once to avoid repetition.

How do I vote?

You may either vote “For” or “Against” or abstain from voting with respect to each nominee to the Board and each of the other matters to be voted on.

Stockholders of Record: Shares Registered in Your Name

If you are a stockholder of record, you may vote electronically at the annual meeting, vote by proxy on the internet or by telephone, or vote by proxy using a proxy card that you may request or that we may elect to deliver at a later time. Whether or not you plan to attend the annual meeting, we urge you to vote by proxy to ensure your vote is counted. You may still attend the annual meeting and vote electronically even if you have already voted by proxy.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 2022 ANNUAL MEETING

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 2022 ANNUAL MEETING

What if I return a proxy card or otherwise vote but do not make specific choices?

Stockholder of Record; Shares Registered in Your Name

If you are a holder of record and return a signed and dated proxy card or otherwise vote without marking voting selections, your shares will be voted, as applicable, “For” the election of all eightnine nominees for director, “For” the ratification of the selection of KPMG LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2020,2022, “For” the advisory vote to approve named executive officer compensation and “For” the approval of Gran Tierra’s 2007 Equity Incentive Plan, as amended. If any other matter is properly presented at the annual meeting, your proxyholder (one of the individuals named on your proxy card) will vote your shares using his or her best judgment.

Beneficial Owner; Shares Registered in the Name of a Broker or Bank

If you are a beneficial owner of shares registered in the name of your broker, bank or other nominee, and you do not provide the broker or other nominee that holds your shares with voting instructions, your broker or other nominee may not vote your shares on any proposal other than the ratification of the selection of KPMG LLP as our independent registered public accounting firm at the annual meeting. See “What are ‘broker non-votes’?” below. We encourage you to provide voting instructions to the organization that holds your shares to ensure that your vote is counted on all threefive proposals.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 2022 ANNUAL MEETING

What does it mean if I receive more than one Notice or more than one set of proxy materials?

If you receive more than one Notice or more than one set of proxy materials, your shares may be registered in more than one name or in different accounts. Please follow the voting instructions on the Notices or the instructions on the proxy cards in the proxy materials to ensure that all of your shares are voted.

Can I change my vote after submitting my proxy?

Stockholder of Record; Shares Registered in Your Name

Yes. You can revoke your proxy at any time before the final vote at the annual meeting. If you are the record holder of your shares, you may revoke your proxy in any one of the following ways:

Your most current proxy card or telephone or internet proxy is the one that is counted and must be received by 1:30 p.m.11:00 a.m. (Mountain time) on May 4, 2021,2, 2022, to be counted. The Chair of the Meeting reserves the right to accept late proxies and may waive or extend the proxy cut-off, with or without notice, but is under no obligation to accept or reject any particular late proxy.

Beneficial Owner; Shares Registered in the Name of a Broker or Bank

If your shares are held by your broker or bank as a nominee or agent, you should follow the instructions provided by your broker or bank.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 2022 ANNUAL MEETING

How many votes are needed to approve each proposal?

Corporate Governance and Board Matters

PROPOSAL 1: ELECTION OF DIRECTORS

The Board of Directors is nominating the eightnine individuals identified below for election as directors. Unless you specify differently, proxies received will be voted FOR Robert B. Hodgins, Peter J. Dey, Gary S. Guidry, Evan Hazell, Alison Redford, Ronald W. Royal, Sondra Scott, David P. Smith and Brooke Wade. Each director to be elected and qualified will hold office until the next annual meeting of stockholders and until his or her successor is elected, or, if sooner, until the director’s death, resignation or removal. Each of the nominees listed below is currently a director of Gran Tierra. It is Gran Tierra’s policy to invite nominees for directors to attend the annual meeting and all of the Directors attended the 20202022 annual meeting of stockholders.

Shares represented by executed proxies will be voted, if authority to do so is not withheld, for the election of the eightnine nominees named below. If any nominee becomes unavailable for election as a result of an unexpected occurrence, shares that would have been voted for that nominee will instead be voted for the election of a substitute nominee proposed by Gran Tierra.

PROPOSAL 1: ELECTION OF DIRECTORS

THE BOARD RECOMMENDS A VOTE “FOR” EACH OF THE NOMINEES NAMED BELOW.

NOMINEES FOR DIRECTOR

		ROBERT B. HODGINS   Age: 6970 Calgary, Alberta, Canada Director since May 2015   Director and Independent DirectorBusinessman   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 96.1%93.9%

Mr. Hodgins has been ana corporate director and independent businessman since November 2004. Prior thereto, Mr. Hodgins served as the Chief Financial Officer of Pengrowth Energy Trust (a TSX and NYSE-listed energy trust) from 2002 to 2004. Prior to that, Mr. Hodgins held the position of Vice President and Treasurer of Canadian Pacific Limited (a Toronto Stock Exchange (“TSX”) and NYSE-listed diversified energy, transportation and hotels company) from 1998 to 2002 and was Chief Financial Officer of TransCanada PipeLines Limited (a TSX and NYSE-listed energy transportation company) from 1993 to 1998. At present, Mr. Hodgins serves as a director of AltaGas Ltd., EnerPlus Corporation and MEG Energy Corp. Since September 2018, Mr. Hodgins holds the non-executive, part-time position of Senior Advisor, Investment Banking at Canaccord Genuity Corp. Mr. Hodgins received an Honours Bachelor of Arts in Business from the Richard Ivey School of Business at the University of Western Ontario and received a Chartered Professional Accountant designation and was admitted as a member of the Institute of Chartered Accountants of Ontario in 1977 and Alberta in 1991. Mr. Hodgins is a member of the Institute of Corporate Directors.

Qualifications:Qualifications: With 30-plus years in the oil and gas industry as an executive and director and a strong reputation in the Canadian business community, Mr. Hodgins brings valuable industry and leadership experience to the Board. As a Chartered Professional Accountant and experienced executive in senior financial roles with several Canadian companies, Mr. Hodgins qualifies as one of Gran Tierra’s Audit Committee financial experts.

During the past five years, Mr. Hodgins previously served as a Director of the following public companies: Cub Energy Inc. (until March 2015), Kicking Horse Energy Inc. (until November 2015) and StonePoint Energy Inc. (until September 2015).

PROPOSAL 1: ELECTION OF DIRECTORS

		GARY S. GUIDRY   Age: 6566 Calgary, Alberta, Canada Director since May 2015   Non-Independent Director - President and Chief Executive Officer   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 96.3%92.6%

Mr. Guidry is a professional engineer and has more than 3540 years of experience developing and maximizing assets in the international oil and gas industry. Mr. Guidry has direct experience managing large, international projects, including assets in Latin America, Africa, the Middle-East and Asia. Prior to joining Gran Tierra, Mr. Guidry was the President and Chief Executive Officer of Caracal Energy Inc., a London Stock Exchange listed oil and gas company with operations in Chad, Africa. He held that position from mid-2011 until the company was acquired by Glencore plc for $1.8 billion in mid-2014. In 2014, Mr. Guidry was awarded the Oil Council Executive of the Year award for his leadership role with Caracal. Prior to Caracal, Mr. Guidry was the President and Chief Executive Officer of Orion Oil and Gas (TSX listed), which operated in western Canada from mid-2009 until mid-2011 when it was sold.merged. From May 2005 until December 2008, he was the President and Chief Executive Officer of Tanganyika Oil Company (TSX listed) which operated in Syria and Egypt. Prior to Tanganyika, Mr. Guidry was Chief Executive Officer of Calpine Natural Gas Trust. Mr. Guidry is an Alberta-registered Professional Engineer and a member of the Association of Professional Engineers and Geoscientists. He received a Bachelor of Science in Petroleum Engineering from Texas A&M University in 1980.

QualificationsQualifications:: Mr. Guidry, as Chief Executive Officer, is responsible for the operations, financial management and implementation of the Company’s strategy. Mr. Guidry’s extensive experience in the oil and gas industry and international operations developed through his experience as a senior executive at several publicly traded companies brings valuable expertise and perspective to the Board.

During the past five years, Mr. Guidry previously served as a Director of Shamaran Petroleum Corp. (until June 2018).

PROPOSAL 1: ELECTION OF DIRECTORS

		PETER J. DEY   Age: 8081 Toronto, Ontario, Canada Director since May 2015   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 80.4%93.5%

Mr. Dey has been the Chairman of Paradigm Capital Inc., an investment dealer, since November 2005. Mr. Dey was a Partner of the Toronto law firm Osler, Hoskin & Harcourt LLP, where he specialized in corporate board issues and mergers and acquisitions, from 2001 to 2005, and prior to that from 1985 to 1994 and from 1973 to 1983. From 1994 to 2001, Mr. Dey was Chairman of Morgan Stanley Canada Limited. From 1993 to 1995, Mr. Dey chaired The Toronto Stock Exchange Committee on Corporate Governance in Canada that released the December 1994 report entitled “Where Were the Directors?”, known as the Dey Report and is the co-author of the recently released report: “360 Degree Governance: Where are the Directors in a World of Crisis?”Crisis”. Mr. Dey has also served as Chairman of the Ontario Securities Commission and was Canada’s representative to the Organisation for Economic Co-operation and Development (“OECD”) Task Force that developed the OECD Principles of Corporate Governance released in May of 1999. Mr. Dey attended Queen’s University, where he earned his Bachelor of Science in 1963 and Dalhousie University, where he earned his Bachelor of Laws degree in 1966. He received his Master of Laws degree from Harvard University in 1967.

Qualifications: With more than 40 years of experience dealing with issues of corporate governance ranging from serving on public boards to private practice as a lawyer, Mr. Dey provides significant value to the board of directors of Gran Tierra.

During the past five years, Mr. Dey previously served as a Director of the following public companies: Guayana Goldfields Inc. (until June 2019), Goldcorp Inc. (until April 2017) and Granite REIT Inc. (until June 2017).

PROPOSAL 1: ELECTION OF DIRECTORS

		EVAN HAZELL   Age: 6263 Calgary, Alberta, Canada Director since June 2015   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 96.7%95.1%

Mr. Hazell has been an independent businessman since 2011. He has been involved in the global oil and gas industry for approximately 40 years, initially as a petroleum engineer and then as an investment banker. From 1998 to 2011, Mr. Hazell acted as a managing director at several financial institutions including HSBC Global Investment Bank and RBC Capital Markets. At present he serves as a director of Black Swan Energy and Kaisen Energy Corp. Mr. Hazell also serves as a director of a number of non-profit and community organizations including Opera America, and Pacific Opera Victoria. Mr. Hazell holds a Bachelor of Applied Science degree from Queen’s University, a Master of Engineering degree from the University of Calgary, and a Master of Business Administration degree from the University of Michigan, and is licensed as a Professional Engineer in Alberta.

Qualifications: Mr. Hazell has extensive experience in the global energy industry as well as in the financial sector. Mr. Hazell also has significant experience at nonprofit organizations. His education in business and engineering provides significant value to Gran Tierra.

During the past five years, Mr. Hazell previously served as a Director of the following public companies: Oryx Petroleum Corporation Limited (until June 2016) and Opera America (until August 2021).

PROPOSAL 1: ELECTION OF DIRECTORS

		ALISON M. REDFORD QC Age: 57 Calgary, Alberta, Canada Director since September 2021 Independent Director

Ms. Redford serves as an advisor to national governments and ministries in emerging economies on regulatory reform to promote transparency and investor confidence. She provides independent advice on the creation of regulatory regimes related to climate, social and governance sustainability most recently in Pakistan, Afghanistan, South Sudan and Guyana. Separately, Ms. Redford also serves as a strategic advisor to public companies operating in volatile political climates to assess risk and ensure regulatory compliance, particularly as it relates to Extractive Industries Transparency Initiatives and Community Benefits Agreements for affected Indigenous people. Previously, Ms. Redford served as Premier of Alberta from 2011 to 2014 and as Minister of Justice and Attorney General from 2008. She graduated from the College of Law at the University of Saskatchewan (1988) and also obtained a Master of Arts degree from the School of Oriental and African Studies at the University of London (2021). Ms. Redford was appointed Queens Counsel in 2008. Ms. Redford is a holder of the Institute of Corporate Directors Director designation.

Qualifications: Ms. Redford brings to the Board more than 25 years of experience from most recently serving as an advisor to national governments and ministries in emerging economies on regulatory reform to promote transparency and investor confidence. As well as serving as Premier of Alberta, Minister of Justice and Attorney General to private practice as a lawyer, Ms. Redford provides significant value to the board of directors of Gran Tierra.

During the past five years, Mr. Hazell previously served as a Director of Oryx Petroleum Corporation Limited (until June 2016).

PROPOSAL 1: ELECTION OF DIRECTORS

		RONALD W. ROYAL   Age: 7172 Abbotsford, British Columbia, Canada Director since May 2015   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 96.7%95.1%

Mr. Royal has been an independent businessman since April 2007. Mr. Royal has more than 35 years of experience with Imperial Oil Ltd. and ExxonMobil’s international upstream affiliates. From 2011 to 2014, he served on the board of directors of Caracal Energy Inc., and prior to 2010, several other boards of private oil companies. Prior to retiring in 2007, Mr. Royal was President and Production Manager of Esso Exploration and Production Chad Inc. and resided in N’Djamena, Chad from 2002 to 2007. In 2003, he was awarded the title “Chevalier de l’Ordre National du Chad” for his contribution to the economic development of Chad. Mr. Royal received his Bachelor of Applied Science from the University of British Columbia in 1972 and completed the Executive Development Program at Cornell University in 1986. He has been a member of the Association of Professional Engineers and Geoscientists of Alberta since 1972.

Qualifications: Mr. Royal brings to the Board over 35 years of experience in senior executive roles in the oil and gas industry, having previously held a variety of management positions both domestically and internationally.

PROPOSAL 1: ELECTION OF DIRECTORS

		SONDRA SCOTT   Age: 5455 New York, New York Director since September 2017   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 97.2%94.2%

Ms. Scott is currently COOan independent businesswoman with more than 25 years of experience as an energy and risk analytics business leader. Ms. Scott was formerly Chief Executive Officer for U.S. and Europe of ADEC Innovations, a leading ESG information and consulting firm where she led a team of professionals providing ESG, environmental and sustainability technical, software and strategy solutions. Prior to this, Ms. Scott was Chief Operating Officer of Verisk Financial where she iswas responsible for leading the company’s global operations team in support their range of portfolio, bankruptcy, fraud and spend solutions. Before joining Verisk Financial in 2020, Ms. Scott was President of Verisk Maplecroft, a leading risk analytics company. Prior to this, Ms. Scott filled a number of roles at Wood Mackenzie over a 13-year period. Her most recent position was head of Global Markets where she led a team focusing on macro energy economics and risk. Previously, Ms. Scott led Wood Mackenzie’s energy consultancy practice. Ms. Scott holds a Master of Science, Petroleum Engineering and Economics degree from a joint program with the University of Pennsylvania and the Institut Francais du Petrole (IFP) and received a Bachelor of Arts, Economics and Earth Sciences degree from Wesleyan University.

Qualifications: Ms. Scott has more than 25 years of experience as an energy and risk analytics business leader. She has significant leadership experience having led multi-sized global research and consultancy teams. Ms. Scott has worked in the United States, the United Kingdom, and Latin America, globalisingglobalizing businesses and building local practices.

PROPOSAL 1: ELECTION OF DIRECTORS

		DAVID P. SMITH   Age: 6263 Parry Sound, Ontario, Canada Director since May 2015   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 96.0%95.3%

Mr. Smith is a corporate director with extensive experience in the investment banking, investment research and management industry. He has been the Chairman of the Board of Directors of Superior Plus Corp., a diversified energy and specialty chemicals company, since August 2014. From March 2004 to August 2015, Mr. Smith served as Chair of the Audit Committee of Superior Plus Corp. Previously, Mr. Smith was Managing Partner of Enterprise Capital Management Inc. from 1997 to 2011. Mr. Smith is a Chartered Financial Analyst and graduated with honors from the University of Western Ontario with a degree in Business Administration in 1981.

Qualifications: Mr. Smith brings to the Board significant financial expertise, having spent his professional career in investment banking, investment research and management. His experience as the Chairman at Superior Plus Corp. and his previous experience as a director and member of the audit committee of other public companies provide valuable perspective to Gran Tierra’s Board. Mr. Smith’s education and experience qualifies him as one of Gran Tierra’s Audit Committee financial experts.

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		BROOKE WADE   Age: 6768 Vancouver, British Columbia, Canada Director since June 2015   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 86.7%94.0%

Mr. Wade is the President of Wade Capital Corporation, a private investment company active in private equity, oil and gas, real estate and industrial businesses. From 1994 until 2005, Mr. Wade was the co-founder and Chairman and Chief Executive Officer of Acetex Corporation, a publicly traded chemical company specializing in acetyls, specialty polymers, and films. In July 2005, Acetex was acquired by Blackstone. Prior to founding Acetex Corporation, Mr. Wade was founding President and Chief Executive Officer of Methanex Corporation. In 1991, Ocelot Industries spun out its oil and gas assets and began a plan of growth through acquisition into what is today Methanex Corporation—the world’s largest methanol producer. Prior to joining Ocelot, he was involved in a number of independent business ventures. Mr. Wade serves on the boards of several private companies including Novinium, Inc., Belkin Enterprises Ltd., Chairman of Atlas Power Technologies Inc. and is a member of the Advisory Board of Northbridge Capital Partners and is a participant of AEA Investors groups of funds. In addition, Mr. Wade is a member of the Dean’s Advisory Council of the John F. Kennedy School of Government at Harvard University. Mr. Wade earned a Bachelor of Commerce Degree from the University of Calgary in 1974 and received his Chartered Accountant designation in 1977. In 2012, Mr. Wade became a Fellow of the Institute of Chartered Accountants of British Columbia.

Qualifications:Qualifications: Mr. Wade’s extensive executive experience provides the Board with strong leadership and decision-making capabilities. His service on other public company boards provides Gran Tierra with public company senior executive and board member perspectives and judgment important to guiding our company.

During the past five years, Mr. Wade previously served as a Director of PKM Canada Limited, formerly, Kinder Morgan Canada Limited (until November 2019).

Majority Voting Standard

Our Bylaws provide for a majority voting standard for the election of directors in uncontested elections, which is generally defined as an election in which the number of nominees does not exceed the number of directors to be elected at the meeting. Because this is an uncontested election, each director shall be elected by the vote of a majority of the votes cast at a meeting of stockholders at which a quorum is present. A “majority of the votes cast” means that the number of shares voted “For” a director nominee must exceed the number of votes cast “Against” that director nominee. For these purposes, abstentions and broker non-votes will not count as a vote “For” or “Against” a nominee’s election and will have no effect in determining whether a director nominee has received a majority of the votes cast. If an incumbent director is not elected by a majority of the votes cast, the incumbent director must promptly tender his or her or her resignation to the Board. The Nominating and Corporate Governance Committee will make a recommendation to the Board on whether to accept or reject the director’s resignation or whether other action should be taken. The Nominating and Corporate Governance Committee shall recommend, and the Board of Directors’ decision shall be, to accept the resignation absent exceptional circumstances. The Board will act on the Nominating and Corporate Governance Committee’s

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resignation absent exceptional circumstances. The Board will act on the Nominating and Corporate Governance Committee’s recommendation within 90 days from the date of the meeting of stockholders and publicly disclose its decision If the Board of Directors determines not to accept a resignation, the public disclosure shall fully state the reasons for such decision. A director who tenders his or her or her resignation after failing to receive a majority of the votes cast will not participate in the Nominating and Corporate Governance Committee’s or the Board’s recommendation or decision or any deliberations related thereto.

Other Information Regarding Our Directors

Our above-listed directors have neither been convicted in any criminal proceeding during the past ten years nor been parties to any judicial or administrative proceeding during the past ten years that resulted in a judgment, decree or final order enjoining them from future violations of, or prohibiting activities subject to, federal or state securities laws or a finding of any violation of federal or state securities law or commodities law. Similarly, no bankruptcy petitions have been filed by or against any business or property of any of our directors or officers, nor has any bankruptcy petition been filed against a partnership or business association in which these persons were general partners or executive officers.

Skills Matrix

Below is a listing of each director’s key skills, together with a description of those key skills and experience desirable to support the strategic direction of Gran Tierra. Not every director is expected to be skilled in every area, however, we aim for the Board to have a balance of skills and experience. We believe the combination of the skills and qualifications shown below demonstrates how our board is well-positioned to provide effective oversight and strategic advice to our management.

Independence of the Board of Directors

The Company believes in the importance of directors’ independence and follows rules of the NYSE American. As required under the NYSE American listing standards, a majority of the members of a listed company’s board of directors must qualify as “independent,” as affirmatively determined by the Board.

The Board conducts an annual review regarding the independence from the Company’s management of each of its members. After review of all relevant identified transactions or relationships between each director, or any of his or her family members, and Gran Tierra, its senior management and its independent auditors, the Board has affirmatively determined that, other than Mr. Guidry, each of our directors and nominees for director (Peter J. Dey, Evan Hazell, Robert B. Hodgins, Alison Redford, Ronald W. Royal, Sondra Scott, David P. Smith and Brooke Wade), are independent directors within the meaning of the applicable NYSE American listing standards. In making this determination, the Board found that none of these directors or nominees for director had a material

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or other disqualifying relationship with Gran Tierra. Mr. Guidry, Gran Tierra’s President and Chief Executive Officer, is not an independent director by virtue of his employment with Gran Tierra. The Board considered and confirmed that Mr. Hodgins’ position as Senior Advisor, Investment Banking at Canaccord Genuity Corp. did not impede his independence as a Director of the Company.

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THE BOARD’S ROLE AND RESPONSIBILITIES

Role of the Board of Directors

The Board is selected by the stockholders to provide oversight of and strategic guidance to senior management. The core responsibility of a Board member is to fulfill his or her or her fiduciary duties of care and loyalty and otherwise to exercise his or her business judgment in the best interests of the Company and its stockholders. The Board has responsibilities to review, approve and monitor fundamental financial and business strategies and major corporate actions, assess major risks facing the Company and consider ways to address those risks, select and oversee management and determine its composition and oversee the establishment and maintenance of processes and conditions to maintain the integrity of the Company. Directors must act with integrity and are expected to demonstrate a commitment to the company, its values and its business and to long-term stockholder value. The duties and responsibilities of the Board and significant issues of corporate governance are set out in the Company’s Corporate Governance Guidelines which are regularly reviewed by the Nominating and Corporate Governance Committee. The guidelines are available on the Company’s website at www.grantierra.com/governance.

Succession Planning

As part of its mandate and annual workplan, the Nominating and Corporate Governance Committee reviews the succession plan for each senior officer, including the President and Chief Executive Officer. The Nominating and Corporate Governance Committee is responsible for ensuring that there is an orderly succession plan for the position of the President and Chief Executive Officer and other members of senior management. To meet this obligation, the President and Chief Executive Officer meets with the Nominating and Corporate Governance Committee and reviews each position, the status of the incumbent, a review of our talent pool and the succession plan for each role.

Board Role in Risk Oversight

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During fiscal 2020, the Board was highly engaged with the Chief Executive Officer and other management with regards to the impact of COVID-19 and the Company’s response and plans. The Board held additional meetings, and management held regular informational calls with Board members throughout the spring and summer covering the impact on the Company’s employees, operations, financial position and other related matters. Management has also engaged with the Board on identifying and addressing strategic risks and opportunities arising out of COVID-19. During the pandemic, Gran Tierra adjusted the planned in-person Board meetings to hold them virtually to ensure continued effective functioning of the Board.

Communications with the Board of Directors

Stockholders are encouraged to communicate by voting on the items in the proxy statement, by attending the annual meeting, by participating in the Company’s quarterly investor calls and by contacting us by mail or email. Security holders wishing to communicate with the Board or an individual director may send a written communication addressed to the Secretary of the Company at 900, 520 - 3rd Avenue S.W., Calgary, Alberta T2P 0R3, Canada, Attention: Secretary. Communications also may be sent by e-mail to the following address info@grantierra.com. Further information about Gran Tierra’s Security Holder Communication Process is available on Gran Tierra’s website at www.grantierra.com/governance.

BOARD STRUCTURE AND PROCESSES

Board Leadership Structure

The positions of Board Chair and the Chief Executive Officer of the Company are held by two individuals. We believe separation of the roles of Board Chair and Chief Executive Officer helps preserve our Board’s independence and objectivity and provides an appropriate division of labor between our Board Chair and Chief Executive Officer. The Board believes that the current board leadership structure, coupled with a strong emphasis on board independence, effectively allocates authority, responsibility, and oversight between management and the independent members of our Board. Robert B. Hodgins currently serves as non-executive Board Chair and as a non-executive and independent director. The Board Chair presides over meetings of the Board, presides over meetings of stockholders, consults and advises the Board and its committees on the business and affairs of the Company, and performs additional duties as the Board may otherwise determine and delegate.

Board Effectiveness and Director Assessment

The Board performs an annual self-assessment, led by the Chair of the Nominations and Corporate Governance Committee, to evaluate its effectiveness in fulfilling its obligations. Directors complete a written questionnaire covering performance of the Board and its committees. The Chair of the Nominations and Corporate Governance Committee then interviews each director to obtain an assessment of the effectiveness of the Board and committees, as well as director performance and Board dynamics, summarizes these individual assessments for discussion with the Board and committees, and then leads a discussion with the Nominating and Corporate Governance Committee and the Board.

Considerations in Evaluating Director Nominees

The Nominating and Corporate Governance Committee is responsible for identifying and recruiting new candidates for nomination to the Board. The Nominating and Corporate Governance Committee considers recommendations for nominees for directorships submitted by stockholders. The Company will evaluate director nominees proposed by stockholders on the same basis as recommendations received from any other source. Please see “Stockholder Recommendations and Nominations to the Board” in this Proxy Statement for procedures to recommend individuals for consideration by the Nominating and Corporate Governance Committee to become nominees for election to the Board.

In developing recommendations for the Board, the Nominating and Corporate Governance Committee uses a variety of methods for identifying and evaluating nominees for directors. Candidates for director nominees are reviewed in the context of the current composition of the Board, the operating requirements of Gran Tierra and the long-term interests of stockholders. Some of the qualifications that the Nominating and Corporate Governance Committee considers include: