| 2023 Tennis Open Karlsruhe | |
|---|---|
| Date | 3 – 9 July |
| Edition | 1st |
| Surface | Clay |
| Location | Karlsruhe, Germany |
| Champions | |
| Singles | |
 Alejandro Tabilo | |
| Doubles | |
 Neil Oberleitner /  Tim Sandkaulen | |
The 2023 Tennis Open Karlsruhe was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Karlsruhe, Germany between 3 and 9 July 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 HUN | Zsombor Piros | 112 | 1 |
| Pavel Kotov | 116 | 2 | |
 ESP | Pedro Martínez | 122 | 3 |
 ITA | Giulio Zeppieri | 125 | 4 |
 BRA | Thiago Seyboth Wild | 131 | 5 |
 KAZ | Timofey Skatov | 138 | 6 |
| Ivan Gakhov | 143 | 7 | |
| CHI | Alejandro Tabilo | 144 | 8 |
The following players received wildcards into the singles main draw:
Liam Gavrielides Henri Squire Marko Topo The following players received entry from the qualifying draw:
Alejandro Tabilo def. Giulio Zeppieri 2–6, 1–0 ret. Neil Oberleitner / Tim Sandkaulen def. 
Vít Kopřiva / 
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