Isidore Isou, 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.

Venom and Eternity is a 1951 French avant-garde film by Isidore Isou that grew out of the Lettrist movement in Paris. It created a scandal at the 1951 Cannes Film Festival.