My Own Private Idaho is a 1991 American independent adventure drama film written and directed by Gus Van Sant, loosely based on Shakespeare's Henry IV, Part 1, Henry IV, Part 2, and Henry V. The story follows two friends, Mike Waters and Scott Favor, played by River Phoenix and Keanu Reeves respectively, as they embark on a journey of personal discovery that takes them from Portland, Oregon, to Mike's hometown in Idaho, and then to Rome in search of Mike's mother.

My Own Private Idaho had its premiere at the 48th Venice International Film Festival, and received largely positive reviews from critics, including Roger Ebert and those of The New York Times and Entertainment Weekly. The film was a moderate financial success, grossing over $8 million, above its estimated budget of $2.5 million. Phoenix received several awards for his performance in the film, including the Volpi Cup for Best Actor at the 1991 Venice Film Festival, Best Male Lead from the Independent Spirit Awards, and Best Actor from the National Society of Film Critics.

My Own Private Idaho is considered a landmark film in New Queer Cinema, an early 1990s movement in queer-themed independent filmmaking. Since its release, it has grown in popularity and been deemed a cult classic, especially among LGBT audiences. The film is notable for its then-taboo subject matter and avant-garde style.

In 2024, the film was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".