The famous singer known for the song "Ain't No Mountain High Enough" is Diana Ross. Originally performed by the duo Marvin Gaye and Tammi Terrell, Ross's rendition with The Supremes brought the song iconic status. Her powerful vocals and vibrant stage presence contributed to the song's enduring popularity. Ross's influence spans across various genres, establishing her as a pivotal figure in the music industry and an emblem of female empowerment.