2021 Antalya Challenger III – Singles

Carlos Taberner was the defending champion but was not eligible to compete in the tournament due to his ATP ranking.

Nuno Borges won the title after defeating Ryan Peniston 6–4, 6–3 in the final.

Seeds
• # 🇹🇷 Cem İlkel (second round)

• # 🇮🇳 Ramkumar Ramanathan (quarterfinals)

• # João Domingues (second round)

• # Duje Ajduković (quarterfinals)

• # Tseng Chun-hsin (first round)

• # Nuno Borges (champion)

• # 🇫🇷 Geoffrey Blancaneaux (second round)

• # Gonçalo Oliveira (first round, retired)