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.

Catholic Church titles
Preceded by Bishop of Peterborough
1943–1945
Succeeded by
Catholic Church titles
Preceded by Titular Bishop of Ancusa
1945–1950
Succeeded by
Catholic Church titles
Preceded by Bishop of Antigonish
1950–1959
Succeeded by
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