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-3 of Y-mAbs Therapeutics, Inc. of our report dated March 22, 2019 relating to the financial statements, which appears in Y-mAbs Therapeutics, Inc's Annual Report on Form 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

Florham Park, New Jersey
October 1, 2019

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