ROGER-MARX, Claude (1888-1988) was a French writer, and playwright, as well as an art critic and art historian like his father Roger Marx (1859–1913). He also used the pen name "Claudinet". He was an important publisher and collector of works by Daumier. His collection is now partly in the Musée du Louvre, Paris.

Roger-Marx, son of Roger Marx and Elisa Nathan (1859–1933), achieved his baccalauréat in 1906, studied at the faculties of law and humanities of the University of Paris, and began to write poems and plays. In 1927 he became a chevalier of the Légion d'honneur. During World War II, in February 1944 he lost his son, who was imprisoned by the Gestapo. Roger-Marx, as a Jew, fled to Marseille in 1941, and in 1943 to Isère.

His real career as critic and art historian started after the war. He was a great admirer of art, and became inspector of the Écoles des Beaux-Arts (schools of fine arts). He also was chroniqueur attitré of the Figaro, especially the Figaro Littéraire, its literary supplement, as well as of the Revue de Paris. In 1956 he was made commander of the Légion d'honneur.