The 1991 Italian Open (known as the Peugeot Italian Open for sponsorship reasons) was a tennis tournament played on outdoor clay courts. It was the 48th edition of the Italian Open, and was part of the ATP Super 9 of the 1991 ATP Tour, and of the Tier I Series of the 1991 WTA Tour. Both the men's and the women's events were held at the Foro Italico in Rome, Italy. The women's tournament was played from 6 May until 12 May 1991, and the men's tournament was played from 13 May until 20 May 1991. Ninth-seeded Emilio Sánchez and second-seeded Gabriela Sabatini won the singles titles.

Finals

Men's singles

🇪🇸 Emilio Sánchez defeated 🇦🇷 Alberto Mancini 6–3, 6–1, 3–0 (retired)

Women's singles

🇦🇷 Gabriela Sabatini defeated Monica Seles 6–3, 6–2

Men's doubles

🇮🇹 Omar Camporese / Goran Ivanišević defeated 🇺🇸 Luke Jensen / 🇦🇺 Laurie Warder 6–2, 6–3

Women's doubles

🇺🇸 Jennifer Capriati / Monica Seles defeated 🇦🇺 Nicole Bradtke / Elna Reinach 7–5, 6–2