Marvin Elan Etzioni is an American singer, mandolinist, bassist, and record producer. Also known as the Mandolin Man, Etzioni is best known as a founder of, and bassist for, the band Lone Justice. He is a noted record producer and has released three solo albums.

Lone Justice was an American country rock band formed in 1982 by guitarist Ryan Hedgecock and singer Maria McKee in Los Angeles. The band released two albums, Lone Justice in 1985 and Shelter the following year, before disbanding in 1987.