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-8 of our reportdatedMarch 8, 2018 relating to the financial statements, which appears in BlackLine Inc.’s Annual Report on Form10-K for the year ended December 31, 2017.
/s/ PricewaterhouseCoopers LLP
Los Angeles, California
March 8, 2018