The Wackiest Ship in the Army is an American comedy drama adventure television series that aired for one season on NBC between September 19, 1965, and April 17, 1966. Produced by Harry Ackerman and Herbert Hirschman, the series was loosely based on the 1960 film starring Jack Lemmon and Ricky Nelson, which itself was a fictionalized account of a real wartime vessel.

Although often referred to as a comedy series, the show violated three unwritten rules that unofficially defined TV sitcoms at the time: It was an hour in length (almost all comedy series were only a half-hour, and the few attempts at hour sitcoms were unsuccessful), it had no laugh track, and characters were sometimes killed in it.