John David "Moon" Martin (born October 31, 1950) is a singer and songwriter.

Originally a rockabilly artist from Altus, Oklahoma, Martin is best known for writing the songs "Bad Case Of Lovin' You (Doctor, Doctor)" made famous by English singer Robert Palmer and "Cadillac Walk" made famous by American singer Willy DeVille.

Martin gained recognition in the 1970s as a pop artist and composer. He was given the nickname "Moon" because many of his songs had "moon" in the lyrics. He also scored two minor hits of own with the song "Rolene" in 1979 and the song "Bad News" in 1980 in France
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