article: Leader of the Official Opposition (Canada)
links: Richard Bedford Bennett Brian Mulroney Thomas Mulcair Lester B. Pearson Herb Gray Charles Tupper Liberal Party of Canada House of Commons of Canada Bloc Québécois Joe Clark Justin Trudeau Official Opposition (Canada) John George Diefenbaker Stéphane Dion Jean Chrétien Rona Ambrose John Diefenbaker Pierre Trudeau R. B. Bennett John A. Macdonald Gilles Duceppe Arthur Meighen Pierre Poilievre Wilfrid Laurier The Honourable Pierre Elliott Trudeau Candice Bergen (politician) Progressive Conservative Party of Canada Mackenzie Bowell Bill Graham (Canadian politician) John Turner John Abbott Louis Stephen St. Laurent Kim Campbell William Lyon Mackenzie King Conservative Party of Canada Erin O'Toole Robert Borden Stephen Harper Lucien Bouchard Alexander Mackenzie (politician) Louis St. Laurent Premier Andrew Scheer Lester Bowles Pearson 2004 Conservative Party of Canada leadership election Michael Ignatieff Michel Gauthier Quebec Paul Martin New Democratic Party Jack Layton John Sparrow David Thompson