The Roman Catholic Church is the world's largest Christian Church, and its largest religious grouping.

Within Canada the heirarchy consists of:

• Archbishopric
  • Bishopric

• Edmonton
  • Calgary
  • Saint Paul, Alberta

• Gatineau-Hull:
  • Amos
  • Mont-Laurier
  • Rouyn-Noranda

• Grouard-McLennan
  • Mackenzie-Fort Smith
  • Whitehorse

• Halifax
  • Antigonish
  • Charlottetown
  • Yarmouth

• Keewatin-Le Pas
  • Churchill-Baie d'Hudson
  • Labrador City-Schefferville
  • Moosonee

• Kingston
  • Alexandria-Cornwall
  • Peterborough
  • Sault Sainte Marie

• Moncton
  • Bathurst
  • Edmundston
  • Saint John, New Brunswick

• Montréal
  • Joliette
  • Saint-Jean-Longueuil
  • Saint-Jérôme
  • Valleyfield

• Ottawa
  • Hearst
  • Pembroke
  • Timmins

• Québec
  • Chicoutimi
  • Sainte-Anne-de-la-Pocatière
  • Trois Rivières

• Regina
  • Prince-Albert
  • Saskatoon

• Rimouski
  • Baie-Comeau
  • Gaspé

• Saint-Boniface

• Saint John's, Newfoundland
  • Grand Falls
  • Saint George's

• Sherbrooke
  • Nicolet
  • Saint-Hyacinthe

• Toronto
  • Hamilton
  • London
  • Saint Catharines
  • Thunder Bay

• Vancouver
  • Kamloops
  • Nelson
  • Prince George
  • Victoria