Vice-Admiral Edmond Rollo Mainguy, OBE, CD (11 May 1901 – 29 April 1979) was a senior officer in the Royal Canadian Navy.

He attended the Royal Naval College of Canada in 1915 during the First World War.

[1] Following the outbreak of the Second World War, Mainguy took command of HMCS Assiniboine and then HMCS Ottawa before being promoted to captain and taking overall command of Royal Canadian Navy (RCN) destroyers in Halifax in 1941.

[1][2] In the post-war years Mainguy was appointed Flag Officer Pacific Coast in 1946, Flag Officer Atlantic Coast in 1948, and was the head of the commission that investigated the RCN insubordination incidents of 1949 before becoming Chief of the Naval Staff in 1951.

Their son, Daniel Mainguy, later also reached the rank of vice-admiral, serving as Vice Chief of the Defence Staff from 1983 to 1985.