Marcel Trillat (born 4 April 1940) is a French journalist and documentary filmmaker.
A communist, he directed many documentaries about the living conditions of workers, women and immigrants in France.
He also did documentaries about French government's response to the Algerian War and the Gulf War and, more recently, religious cults and public hospitals.
He co-directed three documentaries with Maurice Failevic, one of which is about the history of communism in France.