Gilles Duceppe is a retired Canadian politician, proponent of the Quebec sovereignty movement and former leader of the Bloc Québécois. He was a Member of Parliament in the House of Commons of Canada for over 20 years and was the leader of the sovereigntist Bloc Québécois for 15 years in three stints: 1996, 1997-2011 and in 2015. He was Leader of the Official Opposition in the Parliament of Canada from March 17, 1997, to June 1, 1997. He resigned as party leader after the 2011 election, in which he lost his own seat to New Democratic Party (NDP) candidate Hélène Laverdière and his party suffered a heavy defeat; however, he returned four years later to lead the party into the 2015 election. After being defeated in his own riding by Laverdière again, he resigned once more.

The Bloc Québécois is a federal political party in Canada devoted to Quebec nationalism and the promotion of Quebec sovereignty. The Bloc was formed by Members of Parliament (MPs) who defected from the federal Progressive Conservative Party and Liberal Party during the collapse of the Meech Lake Accord. Founder Lucien Bouchard had been a cabinet minister in the federal Progressive Conservative government of Brian Mulroney.