Olivier Assayas (French: [ɔlivje asajas]; born 25 January 1955) is a French film director, screenwriter and film critic. Assayas is known for his eclectic filmography, consisting of slow-burning period pieces, psychological thrillers, neo-noirs, and comedies. He has directed French, Spanish, and English-language films with international casts. The son of filmmaker Jacques Rémy, Assayas began his career as a critic for Cahiers du Cinéma. There he wrote about world cinema and its film auteurs, who later influenced his work. Assayas made several short films, and made his feature debut with Disorder in 1986.

He continued directing feature films, with Cold Water (1994) considered a breakthrough film in his career. It was his first film to screen at the Cannes Film Festival in the Un Certain Regard section. His followup film, Irma Vep (1996), also screened at Cannes, while Sentimental Destinies (2000), Demonlover (2002), and Clean (2004) all officially competed for the Palme d'Or. In 2006, he contributed a short film to the anthology film Paris, je t'aime (2006).