The Roman Catholic Diocese of Trois-Rivières (Latin: Dioecesis Trifluvianensis in Canada) (erected 8 June 1852) is a suffragan of the Archdiocese of Québec.

The Diocese of Trois-Rivières was erected from the Archdiocese of Quebec on June 8, 1852. Rev. Thomas Cooke was appointed the first bishop. At that time, the diocese extended to the Eastern Townships, and included thirty-nine parishes.

The Collège des Trois-Rivières was founded in 1860; in 1874, it became the diocesan seminary. Also in 1874, the Diocese of Sherbrooke was created from Trois-Rivières. Notre-Dame-du-Cap was designated a national pilgrimage site by the bishops of Canada in 1909.

• Thomas Cooke (1852 - 1870)
• Louis-François Richer dit Laflèche (1870 - 1898)
• François-Xavier Cloutier (1899 - 1934)
• Alfred-Odilon Comtois (1934 - 1945)
• Maurice Roy (1946 - 1947), appointed Archbishop of Québec
• Georges-Léon Pelletier (1947 - 1975)
• Laurent Noël (1975 - 1996)
• Martin Veillette (1996 - 2012)
• Luc-André Bouchard (2012 - 2021)
• Martin Laliberté, P.M.E. (2022–present)

• Louis-François Richer dit Laflèche (1866-1870)

• Pierre Olivier Tremblay, O.M.I. (2018- )

• Jean-Guy Hamelin, appointed Bishop of Rouyn-Noranda, Québec

Year	Along with	To form
1874	Archdiocese of Québec Diocese of Saint-Hyacinthe	Diocese of Sherbrooke
1882	Diocese of Ottawa Archdiocese of Saint-Boniface	Vicariate Apostolic of Pontiac
1885		Diocese of Nicolet

• "Diocese of Trois Rivières". Catholic-Hierarchy. Retrieved 2007-03-15.

• diocesan website

46°21′00″N 72°33′00″W / 46.3500°N 72.5500°W / 46.3500; -72.5500