See main article: 2021 Internazionali di Tennis Città di Forlì.
Tomislav Brkić and Nikola Ćaćić were the defending champions[1] but chose not to defend their title.
Sergio Galdós and Orlando Luz won the title after defeating Pedro Cachin and Camilo Ugo Carabelli 7–5, 2–6, [10–8] in the final.