Pierre Lambert (real name Pierre Boussel; June 9, 1920 – January 16, 2008) was a French Trotskyist leader, who for many years acted as the central leader of the French Courant Communiste Internationaliste (CCI) which founded the Parti des Travailleurs. Differences between Lambert and Bleibtreu forced the latter to leave the PCI. By this time, 1952, the PCI had split into two mutually hostile groups on the question of entrism sui generis and the associated perspective of hundreds of years of deformed workers states propagated by Pablo. Lambert died in Paris.