2023 Nonthaburi Challenger – Singles

Stuart Parker was the defending champion but lost in the qualifying competition to Giovanni Fonio.

Dennis Novak won the title after defeating Wu Tung-lin 6–4, 6–4 in the final.

Seeds
• # 🇭🇺 Fábián Marozsán (second round)

• # 🇦🇹 Dennis Novak (champion)

• # Wu Tung-lin (final)

• # 🇫🇷 Antoine Escoffier (semifinals)

• # 🇮🇹 Gianluca Mager (first round)

• # 🇬🇧 Paul Jubb (first round)

• # 🇦🇺 Max Purcell (quarterfinals)

• # Hsu Yu-hsiou (quarterfinals)