2023 Nonthaburi Challenger III – Singles

Arthur Cazaux was the defending champion but lost in the final to Sho Shimabukuro.

Shimabukuro won the title after defeating Cazaux 6–2, 7–5 in the final.

Seeds
• # 🇦🇺 James Duckworth (second round)

• # Alexander Ritschard (first round)

• # 🇫🇷 Antoine Escoffier (quarterfinals, retired)

• # 🇫🇷 Evan Furness (first round)

• # 🇬🇧 Paul Jubb (first round)

• # 🇷🇴 Nicholas David Ionel (first round)

• # 🇩🇪 Peter Gojowczyk (withdrew)

• # 🇨🇿 Zdeněk Kolář (quarterfinals)