2023 Calgary National Bank Challenger – Men's singles

Dominik Koepfer was the defending champion but lost in the final to Liam Draxl.

Draxl won the title after defeating Koepfer 6–4, 6–3 in the final.

Seeds
• # 🇩🇪 Dominik Koepfer (final)

• # 🇦🇺 James Duckworth (second round)

• # 🇫🇷 Benoît Paire (first round)

• # 🇨🇦 Gabriel Diallo (semifinals, withdrew)

• # 🇬🇧 Ryan Peniston (first round)

• # 🇧🇪 Zizou Bergs (quarterfinals)

• # 🇧🇪 Kimmer Coppejans (first round)

• # 🇹🇳 Aziz Dougaz (quarterfinals)