Martha Wainwright (born May 8, 1976) is a Canadian-American folk-rock singer-songwriter. She is the daughter of American folk singer and actor Loudon Wainwright III and Canadian folk singer-songwriter Kate McGarrigle. She was raised in a musical family along with her older brother, Rufus Wainwright, in Montreal, Quebec, Canada.

The Aviator
2004 · as Cocoanut Grove Vocalist #3

Leonard Cohen: I'm Your Man
2006 · as Self

A Not So Silent Night
2008 · as Self

Canadian Hits at the BBC
2021 · as Self

Plamondon: des mots qui résonnent
2024

Rallumer les étoiles à Béthanie
2021 · as Self

The McGarrigle Hour
1999 · as self

Burning Ice
2010 · as Self

Sing Me the Songs That Say I Love You: A Concert for Kate McGarrigle
2013 · as Herself

À grands coups d’amour pour Gerry : 25 ans plus tard
2015 · as Self

The Girl with the Red Beret
2023 · as Self

One Man Guy
1993 · as Self

Rufus Wainwright: Live at the FiIlmore
2004 · as Herself