| John Randoll Mackenzie | |
| Birth Date: | c. 1763 |
| Death Date: | 28 July 1809 |
| Allegiance: | United Kingdom |
| Branch: | British Army |
| Serviceyears: | 1778–1809 |
| Rank: | Major-General |
| Commands: | 3rd Division |
| Battles: | Napoleonic Wars |
Major-General John Randoll Mackenzie of Suddie (c. 1763 – 28 July 1809) was a senior British Army officer who saw action in the Napoleonic Wars.
MacKenzie was the son of William Mackenzie of Suddie and Margaret Mackenzie (daughter of Sir Alexander Mackenzie, 5th Baronet).[1]
Mackenzie was commissioned as a second lieutenant in the Marines in 1778.[1] After serving in India, he secured a commission as a captain in the 78th Regiment of Foot when it was raised in 1793 and was deployed to the Dutch Cape Colony in 1795.[1] He was elected as member of parliament for Tain Burghs in 1806 and then transferred to Sutherland in 1808.[1] Deployed to Spain for service in the Peninsular War, he commanded a brigade in the 3rd Division and also became the first General Officer Commanding 3rd Division when it was formed on 18 June 1809.[2] He was killed in action at the Battle of Talavera on 28 July 1809.[3]