"Turn! Turn! Turn!", also known as or subtitled "To Everything There Is a Season", is a song written by Pete Seeger in 1959. The lyrics – except for the title, which is repeated throughout the song, and the final two lines – consist of the first eight verses of the third chapter of the biblical Book of Ecclesiastes. The song was originally released in 1962 as "To Everything There Is a Season" on the folk group the Limeliters' album Folk Matinee, and then some months later on Seeger's own The Bitter and the Sweet.

The song became an international hit in late 1965 when it was adapted by the American folk rock group the Byrds. The single entered the U.S. chart at number 80 on October 23, 1965, before reaching number one on the Billboard Hot 100 chart on December 4, 1965. In Canada, it reached number 3 on November 29, 1965, and also peaked at number 26 on the UK Singles Chart.