2023 Championnats Banque Nationale de Granby – Men's singles

Gabriel Diallo was the defending champion but chose not to defend his title.

Alexis Galarneau won the title after defeating Philip Sekulic 6–4, 3–6, 6–3 in the final.

Seeds
• # 🇦🇺 Thanasi Kokkinakis (second round, retired)

• # 🇫🇷 Arthur Cazaux (second round)

• # 🇨🇳 Shang Juncheng (first round)

• # 🇨🇦 Vasek Pospisil (first round)

• # 🇺🇸 Denis Kudla (second round)

• # 🇯🇵 Rio Noguchi (first round)

• # 🇨🇦 Alexis Galarneau (champion)

• # 🇫🇷 Giovanni Mpetshi Perricard (first round)