The Diocese of Catarman (Lat: Dioecesis Catarmaniensis) is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church in the Philippines.

[2] Erected in 1974, the diocese is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Palo.

The Diocese of Catarman has experienced no jurisdictional changes since its establishment.

[2][3] Nolly Buco, a former auxiliary bishop of the Roman Catholic Diocese of Antipolo, was initially appointed as apostolic administrator by Pope Francis when Bishop Emmanuel Trance retired as bishop of the diocese on 8 December 2023.

[4] In 18 October 2024, Pope Francis subsequently appointed him as the third bishop of Catarman;[5] he was installed on 15 January 2025.