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. Emilio Sánchez and Gabriela Sabatini won the singles titles.
See main article: 1991 Italian Open – Men's singles. Emilio Sánchez defeated Alberto Mancini 6–3, 6–1, 3–0 (retired)
See main article: 1991 Italian Open – Women's singles. Gabriela Sabatini defeated Monica Seles 6–3, 6–2
See main article: 1991 Italian Open – Men's doubles. Omar Camporese / Goran Ivanišević defeated Luke Jensen / Laurie Warder 6–2, 6–3
See main article: 1991 Italian Open – Women's doubles. Jennifer Capriati / Monica Seles defeated Nicole Bradtke / Elna Reinach 7–5, 6–2