The Roman Catholic Diocese of Baie-Comeau (Latin: Dioecesis Sinus Comoënsis) (erected 29 May 1882, as the Prefecture Apostolic of Golfe St-Laurent) is a suffragan of the Archdiocese of Rimouski.

The organization is based in Baie-Comeau, Quebec.

It was elevated as the Vicariate Apostolic of Golfe St-Laurent on 12 September 1905 and as the Diocese of Golfe St-Laurent on 24 November 1945.

It became the Diocese of Hauterive in 1960 then the Diocese of Baie-Comeau in 1986, following the fusion of Hauterive and Baie-Comeau in 1982.

This article about a Roman Catholic diocese in Canada is a stub.