Vasto Cathedral (Italian: Duomo di Vasto; Concattedrale di San Giuseppe) is a Roman Catholic cathedral in Vasto, Abruzzo, Italy, dedicated to Saint Joseph.

Formerly the episcopal seat of the Diocese of Vasto, it is now a co-cathedral in the Archdiocese of Chieti-Vasto.

Vasto Cathedral was built some time during the 13th century as St. Augustine, but it was soon changed to its current name.

It was dedicated as a cathedral by then-Pope Pius IX in 1853, but demoted to co-cathedral in 1986.

This article on a Catholic cathedral in Italy is a stub.