The 1991 Volvo San Marino Open was a women's tennis tournament played on outdoor clay courts at the Centro Sportivo Tennis in the City of San Marino, San Marino that was part of the Tier V category of the 1991 WTA Tour. It was the inaugural edition of the WTA San Marino and was held from 15 July until 21 July 1991. Second-seeded Katia Piccolini won the singles title and earned $13,500 first-prize money.[1] [2]
See main article: 1991 Volvo San Marino Open – Singles. 
Katia Piccolini defeated Silvia Farina 6–2, 6–3
See main article: 1991 Volvo San Marino Open – Doubles. 
Kerry-Anne Guse / 
Akemi Nishiya defeated Laura Garrone / 
Mercedes Paz 6–0, 6–3