Juan Mackenna | |
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| Born | 26 October 1771 Monaghan, County Monaghan, Kingdom of Ireland |
| Died | 21 November 1814 (aged 43) Buenos Aires, United Provinces of the Río de la Plata |
| Allegiance | Spain Chile |
| Battles / wars | |
Brigadier Juan Mackenna (26 October 1771 – 21 November 1814) was an Irish-born, Chilean military officer and hero of the Chilean War of Independence. He is considered to have been the creator of the Corps of Military Engineers of the Chilean Army.