Isobel Campbell (born 27 April 1976) is a Scottish singer-songwriter, cellist and composer. Campbell rose to prominence at age nineteen as a member of the Scottish indie pop band Belle & Sebastian, but left the group to pursue a solo career, first as The Gentle Waves, and later under her own name. She later collaborated with singer Mark Lanegan on three albums.

Campbell's music has been described as either indie pop, chamber pop or singer-songwriter. Regardless of genre, Campbell makes gentle and sombre music, often using classical instruments and her bright, slightly nasal voice with bittersweet and ironic songwriting.