| 2023 Sibiu Open | |
|---|---|
| Date | 18–24 September |
| Edition | 12th |
| Location | Sibiu, Romania |
| Champions | |
| Singles | |
 Nerman Fatić | |
| Doubles | |
 Andrew Paulson / Michael Vrbenský | |
The 2023 Sibiu Open was a professional tennis tournament played on clay courts. It was the 12th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Sibiu, Romania between 18 and 24 September 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 HUN | Zsombor Piros | 111 | 1 |
 ITA | Flavio Cobolli | 132 | 2 |
| BIH | Damir Džumhur | 157 | 3 |
| Ivan Gakhov | 161 | 4 | |
| ITA | Stefano Travaglia | 205 | 5 |
 CRO | Duje Ajduković | 206 | 6 |
| ITA | Alessandro Giannessi | 214 | 7 |
| BIH | Nerman Fatić | 218 | 8 |
The following players received wildcards into the singles main draw:
Bor Artnak 
Cezar Crețu Sebastian GimaThe following players received entry from the qualifying draw:
Vlad Andrei Dancu
Calvin Hemery Filip Cristian Jianu 
Henri Laaksonen Andrew Paulson Michael Vrbenský Nerman Fatić def. Damir Džumhur 6–2, 6–4. Andrew Paulson / Michael Vrbenský def. 
Piotr Matuszewski / 
Kai Wehnelt 6–2, 6–2.