Isidore Isou (French: [izu]; 29 January 1925 – 28 July 2007), born Isidor Goldstein, was a Romanian-born French poet, dramaturge, novelist, film director, economist, and visual artist. He was the founder of Lettrism, an art and literary movement which owed inspiration to Dada and Surrealism.
An important figure in the mid-20th Century avant-garde, he is remembered in the cinema world chiefly for his revolutionary 1951 film Traité de Bave et d'Eternité, while his political writings are seen as foreshadowing the May 1968 movements.