Galerie de l’Effort Moderne was an avant-garde art gallery in Paris, France, founded in 1918 by by Léonce Rosenberg. It was one of the most important forums for avant-garde art in the interwar period.

The gallery showed works by artists such as Pablo Picasso, Salvador Dalí, Joan Miró, Jean Cocteau, and Wassily Kandinsky. It also staged exhibitions of architecture and design, including the first solo show of Le Corbusier in 1922.

The gallery closed in 1939 at the outbreak of World War II, and its contents were dispersed. Some of the paintings from the gallery’s collection were acquired by the Museum of Modern Art in New York.