"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.

The lyrics are taken almost verbatim from the book of Ecclesiastes, as found in the King James Version of the Bible, (Ecclesiastes 3:1-8) though the sequence of the words was rearranged for the song. Ecclesiastes is traditionally ascribed to King Solomon, who would have written it in the 10th century BC, though modern scholarship dates its composition much later, up to the third century BC:

To every thing there is a season, and a time to every purpose under the heaven:
A time to be born, and a time to die; a time to plant, and a time to pluck up that which is planted;
A time to kill, and a time to heal; a time to break down, and a time to build up;
A time to weep, and a time to laugh; a time to mourn, and a time to dance;
A time to cast away stones, and a time to gather stones together;
A time to embrace, and a time to refrain from embracing;
A time to get, and a time to lose; a time to keep, and a time to cast away;
A time to rend, and a time to sew; a time to keep silence, and a time to speak;
A time to love, and a time to hate; a time of war, and a time of peace.

The Biblical text posits there being a time and place for all things: birth and death, killing and healing, sorrow and laughter, war and peace, and so on. The lines are open to myriad interpretations, but Seeger's song presents them as a plea for world peace with the closing line: "a time for peace, I swear it's not too late." This line and the title phrase "Turn! Turn! Turn!" are the only parts of the lyric written by Seeger himself.

In 1999, Seeger arranged for 45% of the songwriting royalties for "Turn! Turn! Turn!" to be donated to the Israeli Committee Against House Demolitions. He kept 50% of the royalties for his own music and took a further 5% for the lyrics because, in Seeger's own words, "[in addition to the music] I did write six words and one more word repeated three times." Seeger's handwritten lyrics to the song were among documents donated to New York University by the Communist Party USA in March 2007.

The song is notable for being one of a few instances in popular music in which a large portion of the Bible is set to music, other examples being the Melodians' (and Boney M's) "Rivers of Babylon", Sister Janet Mead's "The Lord's Prayer", U2's "40", Sinéad O'Connor's "Psalm 33" and Cliff Richard's "The Millennium Prayer". Since Ecclesiastes is traditionally ascribed to King Solomon in the 10th century BC, the Byrds' 1965 recording of the song holds the distinction in the U.S. of being the number 1 hit with the oldest lyrics.^{[citation needed]}

The song was published in illustrated book form by Simon & Schuster in September 2003, with an accompanying CD which contained both Seeger's and the Byrds' recordings of the song. Wendy Anderson Halperin created a set of detailed illustrations for each set of opposites which are reminiscent of mandalas. The book also includes the Ecclesiastes text from the King James version of the Bible.