| 2023 Ostra Group Open | |
|---|---|
| Date | 24 – 30 April |
| Edition | 20th |
| Surface | Clay |
| Location | Ostrava, Czech Republic |
| Champions | |
| Singles | |
 Zdeněk Kolář | |
| Doubles | |
 Robert Galloway /  Miguel Ángel Reyes-Varela | |
The 2023 Ostra Group Open was a professional tennis tournament played on clay courts. It was the 20th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Ostrava, Czech Republic between 24 and 30 April.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 GBR | Ryan Peniston | 158 | 1 |
| Ivan Gakhov | 162 | 2 | |
| CZE | Vít Kopřiva | 165 | 3 |
 FRA | Geoffrey Blancaneaux | 175 | 4 |
 CHI | |||
 ITA | Riccardo Bonadio | 179 | 6 |
 UKR | Oleksii Krutykh | 180 | 7 |
 BIH | Damir Džumhur | 202 | 8 |
| CZE | Dalibor Svrčina | 203 | 9 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Guido Andreozzi 
Àlex Martí Pujolràs
Rudolf Molleker Patrik Rikl Henri Squire 
Khumoyun Sultanov Zdeněk Kolář def. 
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