Treia Cathedral, otherwise the Church of the Annunciation is a Roman Catholic cathedral in the city of Treia, Macerata, Italy, dedicated to the Annunciation. It was formerly the seat of the bishop of Treia from the creation of the diocese of Treia in 1817 to its merging into the Diocese of San Severino in 1920, and following several other mergers is now a co-cathedral of the Diocese of Macerata-Tolentino-Recanati-Cingoli-Treia.