The Roman Catholic Diocese of Roseau (Latin: Dioecesis Rosensis) is a diocese of the Latin Church of the Roman Catholic Church in the Caribbean.

The diocese encompasses the entirety of the country of Dominica.

The diocese is a suffragan of the Archdiocese of Castries, and a member of the Antilles Episcopal Conference.

The territory was previously part of the former Vicariate Apostolic of Trinidad.

This article about a Catholic diocese is a stub.