| 2023 Istanbul Challenger | |
|---|---|
| Date | 4–10 September |
| Edition | 37th |
| Surface | Hard |
| Location | Istanbul, Turkey |
| Champions | |
| Singles | |
 Damir Džumhur | |
| Doubles | |
 Luke Johnson /  Skander Mansouri | |
The 2023 Istanbul Challenger was a professional tennis tournament played on hard courts. It was the 37th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Istanbul, Turkey between 4 and 10 September 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 KOR | Kwon Soon-woo | 104 | 1 |
 NED | Jesper de Jong | 141 | 2 |
 SVK | Lukáš Klein | 155 | 3 |
 CRO | Dino Prižmić | 176 | 4 |
 BEL | Gauthier Onclin | 198 | 5 |
 FRA | Harold Mayot | 204 | 6 |
| BIH | Damir Džumhur | 211 | 7 |
| SVK | Norbert Gombos | 217 | 8 |
The following players received wildcards into the singles main draw:
Tuncay Duran Koray Kırcı Ergi Kırkın The following players received entry from the qualifying draw:
Damir Džumhur def. Lukáš Klein 7–6(7–5), 6–3. Luke Johnson / Skander Mansouri def. Sander Arends / 
Aisam-ul-Haq Qureshi 7–6(7–3), 6–3.
