J. Keiller MacKay | |
|---|---|
 Official portrait, 1958 | |
| 19th Lieutenant Governor of Ontario | |
| In office December 30, 1957 – May 1, 1963 | |
| Monarch | Elizabeth II |
| Governors General | Vincent Massey Georges Vanier |
| Premier | Leslie Frost John Robarts |
| Preceded by | Louis Orville Breithaupt |
| Succeeded by | William Earl Rowe |
| Personal details | |
| Born | John Keiller MacKay July 11, 1888 Plainfield, Nova Scotia, Canada |
| Died | June 12, 1970 (aged 81) Toronto, Ontario, Canada |
| Resting place | Mt. Pleasant Cemetery |
| Military career | |
| Allegiance | Canada |
| Rank | Lieutenant-Colonel |
| Commands | 6th Brigade, Canadian Field Artillery |
| Battles/wars | Battle of the Somme Battle of Vimy Ridge |
Lieutenant-Colonel John Keiller MacKay OC DSO VD KC (July 11, 1888 – June 12, 1970) was a Canadian soldier, lawyer and jurist. MacKay served as the 19th lieutenant governor of Ontario from 1957 to 1963.