Sing Boy Sing is a 1958 American musical drama film released by 20th Century-Fox and starring newcomers Tommy Sands and Lili Gentle.

The film was an expansion of the January 1957 Kraft Television Theatre episode "The Singin' Idol," also starring Sands, who was billed by the studio as a new teen idol and plays an Elvis Presley-type singer.

The film was Gentle's only starring role, and her penultimate film appearance. 20th Century-Fox had plans to promote her as its new dashing redhead, but suitable roles for her did not materialize.Sing, Boy, Sing was released in the United States in February 1958 to positive reviews, but performed poorly at the box office, though it did find some popularity with teenage audiences.Sands' soundtrack of songs from the film was released in 1958 and produced a #24 hit on the Billboard singles chart with the title song.