Exhibit 23.3
 | Phone +41 44 444 35 55 www.bdo.ch zurich@bdo.ch | BDO Ltd Schiffbaustrasse 2 8031 Zurich |
Consent of Independent Registered Public Accounting Firm
We hereby consent to the incorporation by reference in the Prospectus constituting a part of Onconetix Inc.’s Registration Statement of our report dated February 14, 2024, relating to the financial statements of Proteomedix AG (the Company), appearing in Onconetix Inc’s Current Report on Form 8-K/A filed February 27, 2024. Our report contains an explanatory paragraph regarding the Company’s ability to continue as a going concern.
We also consent to the reference to us under the caption “Experts” in the Prospectus.
| /s/ Christoph Tschumi | /s/ Marc Furlato | |
| Christoph Tschumi | Marc Furlato | |
| BDO AG | ||
| Zurich, Switzerland | ||
| November 1, 2024 |
BDO Ltd, a limited company under Swiss law, incorporated in Zurich, forms part of the international BDO Network of independent member firms.