2023 Istanbul Challenger – Singles

Radu Albot was the defending champion but chose not to defend his title.

Damir Džumhur won the title after defeating Lukáš Klein 7–6(7–5), 6–3 in the final.

Seeds
• # 🇰🇷 Kwon Soon-woo (first round)

• # Jesper de Jong (semifinals)

• # 🇸🇰 Lukáš Klein (final)

• # Dino Prižmić (quarterfinals)

• # 🇧🇪 Gauthier Onclin (first round)

• # 🇫🇷 Harold Mayot (second round)

• # 🇧🇦 Damir Džumhur (champion)

• # 🇸🇰 Norbert Gombos (first round)