The Basilica Abbey of San Mercuriale is the main religious building in Forlì, in Romagna (northern Italy); the rather smaller cathedral was largely destroyed by fire in the 19th century.

The abbey, which once was located outside the ancient Roman city, was included in a new line of walls in that period.

In the 15th century the Vallumbrosans' cloister was annexed to the construction: it has a rectangular shape and is decorated by slender columns, with a central well that can still be seen.

The magnificent rose window over the main portal portrays the Epiphany with Dream and Adoration of the Magi, and is attributed to the so-called Master of the Months, who was active also in the cathedral of Ferrara.

The most famous is the Sepulchre of Barbara Manfredi, the young wife of Pino III Ordelaffi, lord of Forlì.