John Callan (1882–1951) was a New Zealand judge.
John Callan may also refer to:
John Callan (New Zealand politician) (1844–1928), New Zealand politician and attorney, father of John Callan John Fullarton Callan (fl. 1920s), Canadian politician from Ontario John S. Callan (1890–1950), American politician from Nebraska
See also John Callan O'Laughlin (1873–1949), American journalist and public official