1991 Campionati Internazionali di San Marino – Doubles

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.

Seeds
• # 🇪🇸 Marcos Górriz / 🇻🇪 Alfonso Mora (first round)

• # 🇸🇪 Ola Jonsson / Mihnea-Ion Năstase (quarterfinals)

• # 🇦🇷 Christian Miniussi / Diego Pérez (final)

• # 🇮🇹 Massimo Boscatto / 🇮🇹 Massimo Cierro (semifinals)