"Jealous Guy" is a song written and performed by John Lennon, which first appeared on his 1971 album Imagine. It is one of the most commonly covered Lennon songs, with at least 92 recorded cover versions, the most notable being Roxy Music's version, which reached number one in several countries three months after John Lennon's death.

The song's genesis came in India, after The Beatles attended a lecture by Maharishi Mahesh Yogi about a "son of the mother nature". This inspired both Paul McCartney and John Lennon to write songs about the same subject. McCartney's composition "Mother Nature's Son" was selected for The Beatles (The White Album), while Lennon's song "Child of Nature" was not. However, both were demoed at George Harrison's Esher home in May 1968. The demo featured Lennon's double-tracked vocal and playing an acoustic guitar. After that, Lennon continued to play it into the Get Back sessions. Eventually, the lyrics were scrapped and replaced by the now well-known "Jealous Guy" lyrics for Imagine.

Three recordings of "Child of Nature" are currently known. The first is a demo of the song recorded at the home of George Harrison in May 1968. The second, on which George sings backing vocals, was recorded at Twickenham Film Studios on 2 January 1969. A third recording was made at Apple Studios on 24 January. A snatch of the chorus from the second recording appears on the Fly on the Wall bonus disc packaged with Let It Be... Naked.

The bass guitar on the song is played by Klaus Voormann, a friend of The Beatles from their Hamburg days.

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