2023 Challenger Biel/Bienne – Singles

Jurij Rodionov was the defending champion and successfully defended his title after Liam Broady retired trailing 3–6, 0–0 in the final.

Seeds
• # Dominic Stricker (second round)

• # 🇦🇹 Jurij Rodionov (champion)

• # 🇸🇰 Norbert Gombos (quarterfinals)

• # 🇬🇧 Liam Broady (final, retired)

• # 🇫🇮 Otto Virtanen (quarterfinals)

• # 🇨🇿 Zdeněk Kolář (first round)

• # Alexander Ritschard (first round)

• # 🇨🇦 Gabriel Diallo (quarterfinals)