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.

• François-Xavier Bossé (1882–1892)
• Michel-Thomas Labrecque (1892–1903)
• Gustave Maria Blanche, C.I.M. (1905–1916)
• Patrice Alexandre Chiasson, C.I.M. (1917–1920), appointed Bishop of Chatham, New Brunswick
• Julien-Marie Leventoux, C.I.M. (1922–1938)
• Napoléon-Alexandre Labrie, C.I.M. (1938–1956)
• Gérard Couturier (1956–1974)
• Jean-Guy Couture (1975–1979), appointed Bishop of Chicoutimi, Québec
• Roger Ébacher (1979–1988), appointed Bishop of Gatineau-Hull, Québec
• Maurice Couture, R.S.V. (1988–1990), appointed Archbishop of Québec
• Joseph Paul Pierre Morissette (1990–2008), appointed Bishop of Saint-Jérôme, Québec
• Jean-Pierre Blais (2008–)

Year	Along with	To form
1945	Vicariate Apostolic of Golfe St-Laurent Diocese of Harbour Grace	Vicariate Apostolic of Labrador

• "Diocese of Baie-Comeau". Catholic-Hierarchy. Retrieved 2007-03-11.

• Diocese of Baie-Comeau site (in French)

49°11′23″N 68°15′48″W / 49.1896°N 68.2634°W / 49.1896; -68.2634