The Basilica of Sant'Apollinare in Classe ("Saint Apollinaris in Classe") is a church in Classe, Ravenna, Italy, consecrated on 9 May 549 by the bishop Maximian and dedicated to Saint Apollinaris, the first bishop of Ravenna and Classe.
An important monument of late Ancient Roman architecture, early church architecture and Byzantine art, in 1996 it was inscribed with seven other nearby monuments in the UNESCO World Heritage List, which described it as "an outstanding example of the early Christian basilica in its purity and simplicity of its design and use of space and in the sumptuous nature of its decoration". (See: Church architecture.)