Rufus McGarrigle Wainwright (born July 22, 1973) is a Grammy-nominated, Canadian-American singer-songwriter. He has recorded five albums of original music, EPs, and tracks on compilations and film soundtracks.

In addition to his baritone singing voice, he plays piano and guitar, often switching between the two instruments when performing live. While some songs feature just Wainwright and his piano, his later work is often accompanied by rock instrumentation or a symphony orchestra, displaying complex layering and harmonies with an operatic feel. Wainwright is an opera fan and likes Franz Schubert's Lieder. Some of Wainwright's songs are described as "popera" (pop opera) or "baroque pop". Many of his compositions are densely packed amalgams of strings, horns, operatic choruses, ragtime rhythms, with a warm vocal timbre.

He often performs with his sister, Martha Wainwright, on backup vocals. Despite critical acclaim, Wainwright has experienced limited commercial success in the United States, although the release of Release the Stars saw increased media attention there, as did the associated 2007 U.S. tour.