Amalfi Cathedral is a 9th-century Roman Catholic cathedral in the Piazza del Duomo, Amalfi, Italy. It is dedicated to the Apostle Saint Andrew whose relics are kept here. Formerly the episcopal seat of the Diocese of Amalfi, it has been since 1986 that of the Diocese of Amalfi-Cava de' Tirreni.
Predominantly of Arab-Norman Romanesque architectural style, it has been remodeled several times, adding Romanesque, Byzantine, Gothic, and Baroque elements. The cathedral includes the adjoining 9th-century Basilica of the Crucifix.
Leading from the basilica are steps into the Crypt of St. Andrew.