"If This World Were Mine" is a 1967 song by soul music duo Marvin Gaye and Tammi Terrell from their album United. Written solely by Gaye, it was one of the few songs they recorded without Ashford & Simpson writing or producing. When it was released as a single in November 1967 as the B-side to the duo's "If I Could Build My Whole World Around You", it hit the Billboard pop singles chart, peaking at number sixty-eight, and peaked at number twenty-seven on the Billboard R&B singles chart. Gaye would later put the song into his set list during his last tours in the early-1980s as he performed a medley of his hits with Terrell. The song was covered a year later by Joe Bataan on the 1968 Fania Allstars LP Live at the Red Garter, Vol. 2, and in 1969 by Ambrose Slade (pre-Slade) on their album Beginnings.

Fifteen years after the original recording, Luther Vandross and Cheryl Lynn re-recorded it for her album Instant Love and made the song a R&B top five smash peaking at number four in 1982 on the Billboard Hot R&B Singles chart.

A decade later, Coko of SWV and rising R&B singer and Tyrese recorded it for her 1999 solo album Hot Coko. The song is featured on John Legend's 2004 live album Solo Sessions Vol. 1: Live at the Knitting Factory, with Imani Uzuri singing the female lead.

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