"Leaving on a Jet Plane" is a song written by John Denver in 1966 and most famously recorded by Peter, Paul and Mary. The original title of the song was "Oh Babe I Hate To Go" but Denver's then producer, Milt Okun, convinced him to change the title. The song was initially recorded in 1967 by the Chad Mitchell Trio, and later that same year by Spanky and Our Gang. Peter, Paul and Mary's version first appeared on their 1967 Album 1700; however, it did not become a hit until they released it as a single in 1969. It turned out to be their biggest (and final) hit, becoming their only #1 on the Billboard Hot 100 chart in the United States. It was the second to last #1 single of the 1960's. The song also spent three weeks atop the easy listening chart.

John Denver's version of his song, "Leaving on a Jet Plane", was included on his 1969 debut solo album, Rhymes and Reasons. Many other artists have covered this song, including: