2023 Curitiba Challenger – Singles

Agustín Velotti was the defending champion from when the tournament was last held in 2016 but didn't defend his title as he retired from professional tennis.

Hugo Dellien won the title after defeating Oliver Crawford 7–6(8–6), 4–6, 7–6(7–1) in the final.

Seeds
• # 🇦🇷 Juan Manuel Cerúndolo (first round)

• # 🇦🇷 Thiago Agustín Tirante (second round)

• # 🇦🇷 Francisco Comesaña (second round)

• # 🇨🇿 Vít Kopřiva (first round)

• # 🇧🇴 Hugo Dellien (champion)

• # 🇧🇷 Felipe Meligeni Alves (second round)

• # 🇦🇷 Mariano Navone (withdrew)

• # 🇦🇷 Camilo Ugo Carabelli (second round)

• # 🇮🇹 Luciano Darderi (semifinals)