EXHIBIT 31.4
Certification of Chief Financial Officer
I, Richard G. Vincent, certify that:
| 1. | I have reviewed this Form 10-K/A of Oncternal Therapeutics, Inc.; and | 
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. | 
Date: April 28, 2023
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| /s/ Richard G. Vincent | 
| Richard G. Vincent | 
| Chief Financial Officer |