Exhibit 31.1
CERTIFICATIONS
| I, | Richard L. Feinstein, certify that: |
| 1. | I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K/A of Enzon Pharmaceuticals, Inc.; |
| 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 26, 2024
| /s/ Richard L. Feinstein | |
| Richard L. Feinstein | |
| Chief Executive Officer, Chief Financial Officer, and Secretary | |
| (Principal Executive Officer and Principal Financial Officer) |