`` 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 .

Question: who sang if this world were mine with luther vandross
Answer: Tammi Terrell