Martin Luther McCoy (born July 1970) is an American musician and actor. The San Francisco native collaborated extensively with musicians like The Roots and Cody ChesnuTT and appears as one of the six lead characters in the 2007 Beatles musical Across the Universe in the role of "Jo-Jo", who reflects Jimi Hendrix. In the film, McCoy performs the song "While My Guitar Gently Weeps", and provides guitar and vocals on others.

McCoy goes by the stage name of "Martin Luther" in his music career. For his acting work he is credited under his full name.