Tell My Sister is a three-disc compilation album consisting of songs recorded by Kate & Anna McGarrigle.

It was released by Nonesuch Records as a box set on May 3, 2011, a year afters Kate's death.

The third disc comprises demos, including acoustic versions and other previously unreleased tracks.

Andrew Hultkrans of Spin wrote that "The McGarrigles’ songs are deceptively simple, but their inventive arrangements, unpredictable harmonizing, and hints of chanson reveal an eccentric genius.

"[6] Another favorable review of the album was written by AllMusic's Mark Deming, who gave it 4.5 out of 5 stars.