The Official Opposition in Canada is the Canadian New Democratic Party led by Thomas Mulcair. Other opposition parties currently include the Liberals, led by Bob Rae, the Bloc Quebecois, led by Vivian Barbot, and the Green Party, led by Elizabeth May.
Thomas Mulcair, Leader of Canada's New Democratic Party, is the Leader of Her Majesty's Loyal Opposition in Canada's House of Commons. He became the leader of the NDP on 2012 March 24, and the party's national convention, taking over from interim leader Nycole Turmel.