"If I Could Build My Whole World Around You" is a popular song recorded by Marvin Gaye and Tammi Terrell in 1967 and released in December 1967. Written by Harvey Fuqua, Johnny Bristol, and Vernon Bullock, the single was Gaye & Terrell's third single together and the second to go Top Ten on both the Pop and R&B charts of Billboard, peaking at number ten and number two, respectively.
The duo's vocals go back and forth as they described what could be if either was able to "build a world" around their loved one. It was one of few songs that set the duo apart from other R&B duos of the time. In time, this song among other legendary duets by the two soul icons would become the landmark for R&B duets to this day. The song was also one of the few songs that was written by someone other than Ashford & Simpson, who had written several hit songs for the duo.