Pierre Fresnay (April 4, 1897 - January 9, 1975) was a French stage and film actor.

Born Pierre Jules Louis Laudenbach in Paris, France he was encouraged by his uncle, the actor Claude Garry, to pursue a career in theater and film. Fresnay became one of the most important French stage and film actors of his era.

Throughout the 1920s, Fresnay appeared in many popular stage productions, most notably in the title role of Marcel Pagnol’s Marius (1929), which ran for over 500 performances. His first great screen role was as Marius in the 1931 film adaptation of the play of the same name. He played the role again in the next two parts of Marcel Pagnol's Marseilles Trilogy, Fanny (1932) and César (1936).

He appeared in more than sixty films, eight of which were with Yvonne Printemps, with whom he lived since 1934. In that same year, he appeared in Alfred Hitchcock's first version of The Man Who Knew Too Much. One of his most notable films was the 1937 epic Grand Illusion directed by Jean Renoir.

A soldier in the French Army during World War I, he returned to his career a hero. However, under the German occupation of World War II, Fresnay worked for the Franco-German film company Continental, for which he made Henri-Georges Clouzot's Le Corbeau and other films. After the war, he was detained in prison while allegations of collaboration were investigated. After being held for six weeks, he was released as a result of a lack of evidence. Despite Fresnay’s declarations that he worked in films to help save the French film industry in a period of crisis, the move damaged his popularity with the public.

In 1947 he played Vincent DePaul (namesake of DePaul University) in Monsieur Vincent, for which he won the Coupe Volpi for best actor at the Venice Film Festival. He also portrayed Nobel Peace Prize laureate Albert Schweitzer in Il est minuit, Docteur Schweitzer (1952).

In 1954, he published his memoirs, Je suis comédien. Pierre Fresnay continued to perform regularly in film and on stage through to the 1960s. In the 70s, he appeared in a few films for television. From then on, he lived together with the French actress and singer Yvonne Printemps for the rest of his life, co-directing the Théâtre de la Michodière in Paris with her until his death in 1975. He died of respiratory problems at the age of seventy-seven at Neuilly-sur-Seine and is interred there side by side with Yvonne in the Neuilly-sur-Seine community cemetery. In his autobiography (My Name Escapes Me), Alec Guinness states that Fresnay was his favorite actor.

Asked how to say his name, he told The Literary Digest "I think my name is to be pronounced fray-nay. At least, it is the way I pronounce it." (Charles Earle Funk, What's the Name, Please?, Funk & Wagnalls, 1936.)

Sir Alec Guinness states in his autobiography 'My Name Escapes Me' that Fresnay was his favorite actor.