Good Morning, Vietnam is a 1987 American war comedy film written by Mitch Markowitz and directed by Barry Levinson. Set in Saigon in 1965, during the Vietnam War, the film stars Robin Williams as an Armed Forces Radio Service (AFRS) DJ who proves hugely popular with the troops, but infuriates his superiors with what they call his "irreverent tendency". The story is loosely based on the experiences of AFRS DJ Adrian Cronauer.

Most of Williams's performances portraying Cronauer's radio broadcasts were improvisations. The film was released by Buena Vista Pictures (under its Touchstone Pictures banner) to critical and commercial success; for his work in the film, Williams won a Golden Globe Award for Best Actor – Motion Picture Musical or Comedy, and was nominated for an Academy Award for Best Actor and a BAFTA Award for Best Actor in a Leading Role. In 2000, the film ranked number 100 on the American Film Institute's "100 Years...100 Laughs" list, containing 100 movies considered the funniest in American cinema.