Martha Wainwright is a Canadian-American folk-rock singer-songwriter. She released her acclaimed self-titled debut album in 2005, and is well known for her 2008 record I Know You're Married But I've Got Feelings Too. Last year she wrote music for a documentary film, No Woman, No Cry, by former supermodel Christy Turlington Burns, about women around the world dying or potentially dying in labor.

She is the daughter of singers Loudon Wainwright III and Kate McGarrigle and sister of musician Rufus Wainwright.