Mairi Campbell (born 1965) is a Scottish folk singer and musician. Campbell's songs and music have a rooted and powerful quality that range from the everyday to the universal, both in sound and subject matter. Campbell is one half of the duo The Cast, whose version of the Robert Burns poem "Auld Lang Syne" featured in the movie Sex and the City. Campbell is also a member of the ceilidh band The Occasionals, and is a guest musician with the baroque ensemble .