Guy Bouthillier (born in 1939) is a Canadian political expert, teacher and nationalist leader from Quebec.
He had become known previously as the head of the Mouvement Québec français, co-founded by a fellow SSJBM President, François-Albert Angers.
After receiving a degree in Law at McGill University in Montreal, he began teaching political science at the Université de Montréal.
In 1989, he spoke at a demonstration of 60,000 people, one of the largest political gatherings in the history of Quebec, reacting to challenges made to the Charter of the French Language at the Supreme Court of Canada (it judged it unconstitutional), as well as Bill 178, a law from the Robert Bourassa government that modified the reach of the Charter.
His actions are partly responsible with the replacement in Quebec of Victoria Day (or Le Jour de Dollard) with National Patriotes Day by the Bernard Landry government.