Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Amendment No. 1 to the Registration Statement on Form S-3of Nine Energy Service, Inc.of our report dated March 7, 2019relating to the financial statements, which appears in Nine Energy Service, Inc.’s Annual Report onForm 10-K for the year ended December 31, 2018. We also consent to the reference to us under the heading “Experts” in such Registration Statement.
/s/ PricewaterhouseCoopers LLP
Houston, Texas
November 8, 2019