Santa Maria di Collemaggio is a large medieval church in L'Aquila, central Italy. It was the site of the original Papal Jubilee, a penitential observation devised by Pope Celestine V, who is buried there. The church, which therefore ranks as a basilica because of its importance in religious history, sits in isolation at the end of a long rectangular sward of grass at the southwest edge of the town.

The church is a masterpiece of Abruzzese Romanesque and Gothic architecture and one of the chief sights of L'Aquila. The striking jewel-box effect of the exterior is due to a pattern of blocks of alternating pink and white stone; the interior, on the other hand, is massive and austere. Outbuildings include a colonnaded cloister, with the central fountain typical of many other similar Italian cloisters, and the former monastic refectory.

Parts of the structure were significantly damaged in the 2009 earthquake in L'Aquila and the church was reopened in 2017.