Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement onForm S-8 of our report dated February 28, 2019relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in BlackLine, Inc.’s Annual Report on Form10-K for the year ended December 31, 2018.
/s/ PricewaterhouseCoopers LLP
Los Angeles, California
February 28, 2019