Yves Langlois (born in 1947) a.k.a. Pierre Seguin was a Canadian terrorist and member of the Quebec terrorist group Front de Libération du Quebec (FLQ), the group responsible for the 1970 October crisis. Langlois is one of the men who kidnapped British Trade Commissioner to Canada James Cross.
Langlois was arrested in France for possession of illegal firearms and was sentenced to 2 years in prison.