All Floor Crossings

Blanchette Vézina, CAQ MNA and former cabinet minister, crossed to the Conservative Party of Quebec in 2026.

Patry, NDP MP for Jonquière-Alma, crossed to the Bloc Québécois in February 2013, saying he could better serve his constituents and Quebec national interests with the BQ.

Hyer, NDP MP for Thunder Bay-Superior North, left the NDP in 2012 over the party's whipped vote on the long-gun registry. He sat as an independent before joining the Greens in 2…

Van Dongen, a long-serving BC Liberal MLA, crossed to the BC Conservatives in 2012, citing dissatisfaction with Premier Christy Clark's leadership.

St-Denis, NDP MP for Saint-Maurice-Champlain, crossed to the Liberals in January 2012, just months after the NDP's historic Quebec sweep, saying she had always been a Liberal at…

Osborne, a long-serving PC MHA, left the PC caucus and joined the Liberals, citing dissatisfaction with the party's direction.

Casey, PC MLA for Colchester North, crossed to the Liberals in 2011 after clashing with PC leader Jamie Baillie.

Forsyth, a long-serving PC MLA and former cabinet minister, crossed to the Wildrose Alliance with Rob Anderson over dissatisfaction with PC governance.

Anderson, PC MLA for Airdrie-Chestermere, crossed to the Wildrose Alliance along with Heather Forsyth, citing overspending, broken promises, and democratic reform.

Kilgour left the Liberal caucus in 2005, citing the sponsorship scandal and disagreements on Sudan policy. This was his second floor crossing — he had previously crossed from th…

O'Brien left the Liberal caucus over the government's same-sex marriage legislation, sitting as an independent.

Bryden, Liberal MP for Ancaster-Dundas-Flamborough-Aldershot, crossed to the newly formed Conservative Party in 2004, disagreeing with Liberal policies.

Martin, a physician and MP for Esquimalt-Juan de Fuca, left the Canadian Alliance (which was merging with the PCs) to join the Liberals, saying the new Conservative Party was to…

Tremblay was a PC MP who left to join the new Bloc Québécois movement.

Chartrand was among the PC MPs who followed Lucien Bouchard to form the Bloc Québécois after the Meech Lake Accord failure.

Rocheleau was one of the Liberal MPs who left to co-found the Bloc Québécois after the Meech Lake Accord failed.

Lapierre left the Liberals to co-found the Bloc Québécois with Lucien Bouchard after the failure of the Meech Lake Accord, driven by Quebec nationalist sentiment.

Leblanc was a PC MP who joined the Bloc Québécois as a founding member after the collapse of the Meech Lake Accord.

Venne left the PC caucus to join the Bloc Québécois as a founding member, motivated by Quebec sovereignty.

Richardson, former Defence Minister, resigned from the Liberal cabinet and caucus over his opposition to official bilingualism and the government's language policies.

Rock, Liberal MP for Lachine, crossed to the NDP over disagreements with the Liberal government's policies.

Ryan, Liberal MP for Toronto Spadina, crossed to the Progressive Conservatives over policy disagreements with the Trudeau government.

Thompson, former national leader of Social Credit, crossed to the PCs after the Social Credit Party fragmented and lost relevance federally.