2021 Internazionali di Tennis Città di Forlì – Singles

Lorenzo Musetti was the defending champion but chose not to defend his title.

Mats Moraing won the title after defeating Quentin Halys 3–6, 6–1, 7–5 in the final.

Seeds
• # Tallon Griekspoor (first round)

• # 🇮🇹 Alessandro Giannessi (first round)

• # 🇮🇹 Paolo Lorenzi (first round)

• # 🇨🇦 Steven Diez (quarterfinals)

• # 🇹🇷 Cem İlkel (first round)

• # Robin Haase (first round)

• # 🇦🇷 Tomás Martín Etcheverry (semifinals)

• # 🇫🇷 Quentin Halys (final)