John Roderick MacDonald (July 9, 1891 – December 18, 1959) was consecrated as Bishop of Peterborough, Ontario, August 24, 1943; appointed Titular Bishop of Ancusa and Coadjutor-Bishop of Antigonish with right of succession March 3, 1945; succeeded Archbishop James Morrison to the See April 13, 1950; died December 18, 1959.