The Essential Collection is a compilation album for Motown soul singer Tammi Terrell, released by Universal Music Group's Spectrum Music in the United Kingdom in 2001. The compilation includes Terrell's only solo album, Irresistible in its entirety, several B-sides and unreleased tracks, and Terrell's most famous duet recording with singing partner Marvin Gaye, "Ain't No Mountain High Enough.