See main article: 1991 Campionati Internazionali di San Marino.
Vojtěch Flégl and Daniel Vacek were the defending champions, but both players chose to compete at Kitzbühel during the same week.
Jordi Arrese and Carlos Costa won the title by defeating Christian Miniussi and Diego Pérez 6–3, 3–6, 6–3 in the final.[1] [2]