Walker is a 1987 American-Mexican historical, hybrid/weird western film directed by Alex Cox and starring Ed Harris, Richard Masur, René Auberjonois, Peter Boyle, Miguel Sandoval and Marlee Matlin. The film is based on the life story of William Walker, the American filibuster who invaded and made himself president of Nicaragua. It was written by Rudy Wurlitzer and scored by Joe Strummer, who has a small role as a member of Walker's army.

The film is intentionally full of postmodern anachronisms, such as: helicopters, Zippo lighters, automatic rifles, Diet Coke, magazines and cars. It was filmed in Nicaragua, during the Contra War (1979-1990).

The film was released by Universal Pictures on December 4, 1987 to generally polarized reviews and grossed nearly $300 thousand against a production budget of $6 million, becoming a box-office bomb.