2023 Banja Luka Challenger – Singles

Fábián Marozsán was the defending champion but withdrew before his semifinal match against Dino Prižmić.

Prižmić won the title after defeating Kimmer Coppejans 6–2, 6–3 in the final.

Seeds
• # 🇭🇺 Fábián Marozsán (semifinals, withdrew)

• # 🇮🇹 Marco Cecchinato (first round)

• # 🇸🇰 Alex Molčan (second round)

• # 🇫🇷 Benoît Paire (second round)

• # 🇧🇪 Kimmer Coppejans (final)

• # 🇦🇷 Mariano Navone (second round)

• # 🇨🇿 Zdeněk Kolář (first round)

• # 🇧🇦 Damir Džumhur (quarterfinals)