Martha Wainwright (born May 8, 1976) is a Canadian-American folk-rock singer-songwriter. She is the daughter of American folk/blues musician Loudon Wainwright III and Canadian folk singer-songwriter Kate McGarrigle. Along with her older brother, Rufus Wainwright, Martha was raised in Montreal, Quebec, Canada, in a musically fueled household, an environment which helped nurture her musical creativity.