In Old Arizona is a 1928 American pre-Code Western film directed by Raoul Walsh and Irving Cummings, nominated for five Academy Awards, including Best Picture. The film, which was based on the character of the Cisco Kid in the 1907 story "The Caballero's Way" by O. Henry, was a major innovation in Hollywood. It was the first major Western to use the new technology of sound and the first talkie to be filmed outdoors. It made extensive use of authentic locations, filming in Bryce Canyon National Park and Zion National Park in Utah, and the Mission San Juan Capistrano and the Mojave Desert in California. The film premiered in Los Angeles on December 25, 1928, and went into general release on January 20, 1929.

In Old Arizona contributed to creating the image of the singing cowboy, as its star, Warner Baxter, does some incidental singing. Baxter went on to win the Academy Award for Best Actor for his performance. Other nominations included Best Director for Irving Cummings, Best Writing for Tom Barry, Best Cinematography for Arthur Edeson, and Best Picture. The film entered the public domain on January 1, 2024.