Operation Bikini, also titled The Seafighter, is a war film released in 1963 by American International Pictures. It was directed by Anthony Carras and starred Tab Hunter, Frankie Avalon and Scott Brady.

The casting was aimed to capture a varied audience. While Operation Bikini was nominally a World War II war movie, it shared a number of cast members—Avalon, Jody McCrea and Eva Six—with American International's Beach Party (soon to become a franchise), and thrown into the mix were character actor Jim Backus, former screen heartthrob Tab Hunter and Gary Crosby (son of Bing). Avalon sings in two musical interludes, which were shot in color despite the fact that the rest of the film is black and white.