Louise Lanctôt (born March 24, 1947) is a Canadian convicted kidnapper and writer. Born Montreal, Quebec, Canada, Lanctôt is a political activist for the cause of Quebec independence from Canada. Louise Lanctôt was an active member of the Rassemblement pour l'indépendance nationale political party that later merged with the Parti Québécois. She was also a member of the Front de libération du Québec (FLQ) and is the sister of convicted kidnapper Jacques Lanctôt, and was married to Jacques Cossette-Trudel who joined the FLQ with her.