"Unchained Melody" is a 1955 song with music by Alex North and lyrics by Hy Zaret. North wrote the music as a theme for the prison film Unchained (1955), hence the song title. Todd Duncan sang the vocals for the film soundtrack. It has since become a standard and one of the most recorded songs of the 20th century, most notably by the Righteous Brothers in 1965. According to the song's publishing administrator, over 1,500 recordings of "Unchained Melody" have been made by more than 670 artists, in multiple languages.

Unchained is a 1955 prison film written, produced and directed by Hall Bartlett and starring Elroy Hirsch, Barbara Hale, Chester Morris, Todd Duncan, and Johnny Johnston. Based on the non-fiction book Prisoners are People by Kenyon J. Scudder, it is most remembered for its theme song, "Unchained Melody".