Gilles Duceppe, MP (born July 22, 1947) is a Quebec nationalist and social democratic politician in Canada. He is a Member of Parliament in the Canadian House of Commons and the leader of the sovereigntist Bloc Québécois. He is the son of a well-known Quebec actor, Jean Duceppe. He was Leader of the Official Opposition at the Parliament of Canada from March 17, 1997 to June 1st, 1997.

Duceppe was born in Montreal, Quebec, Canada, the son of actor Jean Duceppe and Hélène Rowley. His maternal grandfather was John James Rowley, a Briton by birth. Duceppe's British roots had him once quip that "I’m a bloke who turned Bloc."

A native of Montreal, Quebec, Duceppe's founding experience affecting his views on social justice occurred at the age of 12. He tells a story of an anglophone Grade 6 teacher slapping him after he complained about preferential treatment being given to anglophone students. Duceppe said that he slapped the teacher back. Duceppe became a sovereigntist at the age of 20, inspired by René Lévesque and the founding of the Mouvement Souveraineté-Association.