John Mendelsohn may refer to:
John Mendelsohn (doctor) (1936–2019), American cancer researcher John Mendelsohn (musician) (born 1947), American writer, journalist, musician and graphic designer
See also Jonathan Mendelsohn, Baron Mendelsohn (born 1966), British lobbyist and Labour political organiser Jonathan Mendelsohn (singer) (born 1980), American singer John Mendelson (1917–1978), British Labour Party politician