| 2023 Tiburon Challenger | |
|---|---|
| Date | 2–8 October |
| Edition | 15th |
| Surface | Hard |
| Location | Tiburon, United States |
| Champions | |
| Singles | |
 Zachary Svajda | |
| Doubles | |
 Luke Johnson /  Skander Mansouri | |
The 2023 Tiburon Challenger was a professional tennis tournament played on outdoor hard courts. It was the 15th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Tiburon, United States between October 2 and October 8, 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| USA | Alex Michelsen | 110 | 1 |
| USA | Nicolas Moreno de Alboran | 156 | 2 |
| USA | Zachary Svajda | 167 | 3 |
| USA | Denis Kudla | 173 | 4 |
 CAN | Alexis Galarneau | 176 | 5 |
| CAN | Vasek Pospisil | 186 | 6 |
| GBR | Ryan Peniston | 197 | 7 |
| USA | Tennys Sandgren | 200 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
The following players received entry from the qualifying draw:
Zachary Svajda def. 
Adam Walton 6–2, 6–2. Luke Johnson / Skander Mansouri def. William Blumberg / 
Luis David Martínez 6–2, 6–3.