Operation Petticoat is a 1959 American World War II submarine comedy film in Eastmancolor from Universal-International, produced by Robert Arthur, directed by Blake Edwards, and starring Cary Grant and Tony Curtis.

The submarine film is a subgenre of war film in which the majority of the plot revolves around a submarine below the ocean's surface. Films of this subgenre typically focus on a small but determined crew of submariners battling against enemy submarines or submarine-hunter ships, or against other problems ranging from disputes amongst the crew, threats of mutiny, life-threatening mechanical breakdowns, or the daily difficulties of living on a submarine.