Hon. Henry St John
Born	1738
Died	3 April 1818
Allegiance	Great Britain
Rank	General

General the Honourable Henry St John (1738 – 3 April 1818) was a senior British Army officer. ^[1]

He was born the younger son of John St John, 2nd Viscount St John and his wife Anne Furnese. His elder brother was Frederick St John, 2nd Viscount Bolingbroke.

He joined the British Army in 1754 as an ensign in the Coldstream Regiment of Foot Guards from which he was promoted in 1758 to the rank of Captain in the 18th (The Royal Irish) Regiment of Foot, then stationed in Ireland. In 1760 he was promoted Major in the 91st Regiment of Foot, made Lieutenant-Colonel in 1762 and put on half pay in 1763.

In 1767, he was appointed to the 67th Regiment of Foot, then on garrison duty in Minorca. He received the Brevet rank of Colonel in 1776, and was appointed Colonel of the 36th Regiment of Foot in 1778, a position he held until his death. He was advanced to the rank of Major-General in 1779, to that of Lieut.-General in 1787, and made full General on 26 January 1797.

He died in 1818. He had married Barbara, the daughter of Thomas Bladen and sister of the Dowager Countess of Essex.