The Naples Cathedral (Italian: Duomo di Napoli), or Cathedral of the Assumption of Mary (Italian: Cattedrale di Santa Maria Assunta), is a Roman Catholic cathedral, the main church of Naples, and the seat of the Archbishop of Naples. It is widely known as the Cathedral of Saint Januarius (Cattedrale di San Gennaro), in honour of the city's patron saint.

The present cathedral in Angevin gothic style (Italian: gotico angioino) was commissioned by King Charles I of Anjou.

The Archbishop's Palace adjoins the cathedral.