The Basilica of San Frediano is a Romanesque church in Lucca, Italy, situated on the Piazza San Frediano.
Fridianus (Frediano) was an Irish bishop of Lucca in the first half of the 6th century. He had a church built on this spot, dedicated to St. Vincent, a martyr from Zaragoza, Spain. When Fridianus was buried in this church, the church was renamed Ss. Frediano and Vincenzo. Soon afterwards, a community of Augustinian canons was growing around this church. In the Longobard era, the church and the canon house were enlarged. In 1104, this order was recognized by Pope Paschal II. The prior of St. Frediano was later accorded a rank equal in dignity to that of a bishop.
The church acquired its present appearance of a typical Roman basilica during the period 1112-1147. In the 13th-14th centuries the striking façade was decorated with a huge golden 13th century mosaic representing The Ascension of Christ the Saviour with the apostles below. Berlinghiero Berlinghieri designed it in a Byzantine/medieval style.
Several chapels of the nobility were added in the 14th-16th centuries. These are lavishly decorated with paintings.