| Date: | 7–13 August |
| Edition: | 21st |
| Surface: | Clay |
| Location: | Banja Luka, Bosnia and Herzegovina |
| Champs: | Dino Prižmić |
| Champd: |  Victor Vlad Cornea /  Philipp Oswald |
The 2023 Banja Luka Challenger was a professional tennis tournament played on clay courts. It was the 21st edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Banja Luka, Bosnia and Herzegovina from 7 to 13 August 2023.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Hungary | Fábián Marozsán | 89 | 1 | |
 Italy | Marco Cecchinato | 108 | 2 | |
 Slovakia | Alex Molčan | 120 | 3 | |
 France | Benoît Paire | 126 | 4 | |
 Belgium | Kimmer Coppejans | 160 | 5 | |
 Argentina | Mariano Navone | 168 | 6 | |
 Czech Republic | Zdeněk Kolář | 171 | 7 | |
 Bosnia and Herzegovina | Damir Džumhur | 172 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as special exempts:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
Mirza Bašić
Akira Santillan Aldin Šetkić
Eric Vanshelboim
Miljan ZekićSee main article: 2023 Banja Luka Challenger – Singles.
Kimmer Coppejans 6–2, 6–3.See main article: 2023 Banja Luka Challenger – Doubles.
Victor Vlad Cornea / Philipp Oswald def. 
Andrey Golubev / Denys Molchanov 3–6, 6–1, [15–13].