Lieutenant Colonel John 'Jack' Keefer Mahony | |
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| Born | 30 June 1911 New Westminster, British Columbia |
| Died | 15 December 1990 (aged 79) London, Ontario |
| Allegiance |  Canada |
| Service |  Canadian Army |
| Rank | Lieutenant colonel |
| Unit | The Westminster Regiment |
| Battles / wars | World War II |
| Awards | Victoria Cross |
John Keefer Mahony VC (30 June 1911 – 15 December 1990) was a Canadian recipient of the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces.