Marc Ongley (born 13 December 1952) is an Australian classical and jazz guitarist, composer, and teacher.
He has lived in the United Kingdom since 1991.
Born in Maitland, New South Wales, he became the first Australian to be awarded the Licentiate of the Trinity College of Music, London (LTCL) and the Fellowship of the Trinity College of Music London (FTCL), in 1974 and 1977 respectively.
The Sydney Morning Herald described Ongley as "one of Australia's finest classical guitarists".