William James "Willem" Dafoe (/dəˈfoʊ/ də-FOH; born July 22, 1955) is an American actor. Known for his prolific career portraying diverse roles in both mainstream and arthouse films, he is the recipient of various accolades, including a Volpi Cup Award for Best Actor, with nominations for four Academy Awards, a British Academy Film Award, and four Golden Globe Awards. He received an Honorary Golden Bear in 2018.

Born in Appleton, Wisconsin, Dafoe made his film debut with an uncredited role in Heaven's Gate (1980). He is known for collaborating with both mainstream and auteur filmmakers, including Paul Schrader, Abel Ferrara, Sam Raimi, Yorgos Lanthimos, Lars von Trier, Julian Schnabel, Andrew Stanton, Wes Anderson, and Robert Eggers. He received Academy Award nominations for playing a compassionate army sergeant in the war drama Platoon (1986), Max Schreck in the mystery film Shadow of the Vampire (2000), a kindly motel manager in the coming-of-age film The Florida Project (2017), and Vincent van Gogh in the biopic At Eternity's Gate (2018).