| Daniel Nicolas Mainguy | |
| Rank: | Vice-Admiral |
| Branch: | Canadian Forces |
| Allegiance: |  Canada |
| Birth Date: | 2 December 1930 |
| Birth Place: | Victoria, British Columbia |
| Death Place: | Ottawa, Ontario |
| Serviceyears: | 1949–1985 |
| Awards: | Commander of the Order of Military Merit Canadian Forces' Decoration |
Vice-Admiral Daniel Nicolas Mainguy CMM, CD (2 December 1930–17 August 2010) was a Canadian Forces officer who served as Vice Chief of the Defence Staff.
The son of Vice-Admiral Rollo Mainguy, Mainguy joined the Royal Canadian Navy in 1949, initially in the Reserve and then, from 1950, in the Regular service.[1] He became Commanding Officer of in 1966, Staff Officer and Operations Officer with Standing Naval Force Atlantic in 1967 and Director of Operational Readiness Maritime in 1970.[1] He went on to be Director of Strategic Planning in 1973, Chief of Maritime Doctrine and Operations in 1976 and Chief of Staff to the Commander-in-Chief, Western Atlantic in 1979.[1] After that he became Deputy Chief of the Defence Staff in 1982 and Vice Chief of the Defence Staff in 1983 before retiring in 1985.[1] He died in August 2010.[2]
Mainguy's personal awards and decorations include the following:
| Ribbon | Description | Notes | |
| Order of Military Merit (CMM) |
| ||
| Special Service Medal |
| ||
| Canadian Forces' Decoration (CD) |
|