William Jackson, Scottish harp player and composer
William Jackson (born 14 September 1955) is a Scottish harpist and composer.

William Jackson was born in Cambuslang, near Glasgow. As his grandparents came from County Donegal, he visited Ireland many times, throughout his childhood, and still has a home there. He trained as a music therapist at the Guildhall School of Music in 1992/93, and from 1998 - 2009 he headed the Music therapy department at Mission Children's Hospital in Asheville, North Carolina. In 1969 he formed the Scottish folk group Contraband, who released an album in 1974, then disbanded in 1975. Jackson's brother George (died 1998) was also a member. He became a founding member of Ossian in 1976. He has lived in Ireland since 2009 and works as a music therapist there, while also continuing his concert and teaching work in the US for part of the year.

Ossian disbanded in about 1989, and he continued as a solo artist both as a performer and composer. He became one of the first to compose using both traditional and classical musicians, and his "Wellpark Suite" in 1985 was generally acclaimed as a milestone in Scottish music. From 1989 William Jackson released a series of albums on his own label Mill Records, sometimes using ancient texts, and on one occasion a poem by Kahlil Gibran. In 1996, A Scottish Island was commissioned by the Scottish Chamber Orchestra. In 1999 he wrote Land of Light and won the Song for Scotland competition with this song. It was performed at Edinburgh Castle on 27 July 2000, and was featured at the 2000 Edinburgh Tattoo. He arranged and performed the music for Battle of the Clans, a documentary on The History Channel. As a producer, he has worked with several singers on the anthology Celtic Woman. Duan Àlbanach was recorded with the Scottish Festival Orchestra, recorded live in 2002, but not released until 2003.