Nouveau réalisme (French: new realism) refers to an artistic movement founded in 1960 by the art critic Pierre Restany and the painter Yves Klein during the first collective exposition in the Apollinaire gallery in Milan. Pierre Restany wrote the original manifesto for the group, titled the "Constitutive Declaration of New Realism," in April 1960, proclaiming, "Nouveau Réalisme—new ways of perceiving the real." This joint declaration was signed on 27 October 1960, in Yves Klein's workshop, by nine people: Yves Klein, Arman, Martial Raysse, Pierre Restany, Daniel Spoerri, Jean Tinguely and the Ultra-Lettrists, Francois Dufrêne, Raymond Hains, Jacques de la Villeglé; in 1961 these were joined by César, Mimmo Rotella, then Niki de Saint Phalle and Gérard Deschamps. The artist Christo showed with the group. It was dissolved in 1970.

Contemporary of American pop art, and often conceived as its transposition in France, new realism was, along with Fluxus and other groups, one of the numerous tendencies of the avant-garde in the 1960s. The group initially chose Nice, on the French Riviera, as its home base since Klein and Arman both originated there; new realism is thus often retrospectively considered by historians to be an early representative of the École de Nice movement.