The Basilica of San Vitale is a late antique church in Ravenna, Italy. The sixth-century church is an important surviving example of early Byzantine art and architecture, and its mosaics in particular are some of the most-studied works in Byzantine art. It is one of eight structures in Ravenna inscribed on the UNESCO World Heritage List. Its foundational inscription describes the church as a basilica, though its centrally-planned design is not typical of the basilica form. Within the Roman Catholic Church it holds the honorific title of basilica for its historic and ecclesial importance.

Byzantine architecture is the architecture of the Byzantine Empire, or Eastern Roman Empire, usually dated from 330 AD, when Constantine the Great established a new Roman capital in Byzantium, which became Constantinople, until the fall of the Byzantine Empire in 1453. There was initially no hard line between the Byzantine and Roman Empires, and early Byzantine architecture is stylistically and structurally indistinguishable from late Roman architecture. The style continued to be based on arches, vaults and domes, often on a large scale. Wall mosaics with gold backgrounds became standard for the grandest buildings, with frescos a cheaper alternative.