Otranto Cathedral (Italian: Duomo di Otranto; Basilica Cattedrale di Santa Maria Annunziata) is a Roman Catholic cathedral in the Italian city of Otranto, dedicated to the Annunciation of the Virgin Mary. It is the archiepiscopal seat of the Archdiocese of Otranto. The cathedral was consecrated in 1088. It is 54 metres long by 25 metres wide and is built on 42 monolithic granite and marble columns from unknown quarries. Its plan is a three-aisled nave with an apsidal east end. On either side of the west façade are two lancet windows.
The most famous feature of the cathedral is the 12th-century floor mosaic covering the entire floor of the nave, the sanctuary and the apse, which is one of the best to survive.
