Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on Form S-8of BlackLine, Inc. of our report dated February 27, 2020relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in BlackLine, Inc.’s Annual Report onForm 10-K for the year ended December 31, 2019.
/s/ PricewaterhouseCoopers LLP
Los Angeles, CA
February 27, 2020