Bad Day at Black Rock is a 1955 American film noir neo-Western film directed by John Sturges with screenplay by Millard Kaufman. It stars Spencer Tracy and Robert Ryan with support from Anne Francis, Dean Jagger, Walter Brennan, John Ericson, Ernest Borgnine and Lee Marvin. The film is a crime drama set in 1945 that contains elements of the revisionist Western genre. In the plot, a one-armed stranger (Tracy) comes to a small desert town and uncovers an evil secret that has corrupted the entire community.

The film is based on a short story called "Bad Time at Honda" by Howard Breslin, published by The American Magazine in January 1947. Filming began in July 1954, and the movie went on national release in January 1955. It was a box-office success and was nominated for three Academy Awards in 1956. In 2018, it was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".