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 a radio DJ on Armed Forces Radio Service, 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 radio DJ Adrian Cronauer.

Most of Williams' radio broadcasts were improvised. Williams was nominated for an Academy Award for Best Actor in a Leading Role. The film is number 100 on "AFI's 100 Years…100 Laughs".