| Henry St John | |
| Office1: | Member of Parliament for Huntingdon |
| Term1: | 1621 1625-1625 |
| Death Date: | c. |
| Father: | Oliver St John |
| Relatives: | Alexander St John (brother) Oliver St John (brother) Anthony St John (brother) Beauchamp St John (brother) Rowland St John (brother) Oliver St John (grandfather) |
Sir Henry St John (1590-c.1642) was an English politician who sat in the House of Commons between 1621 and 1625.
St John was a younger son of Oliver St John, 3rd Baron St John of Bletso and his wife Dorothy Reid, daughter of Sir John Rede or Reid, of Odington, Gloucestershire.[1] He was knighted on 24 July 1619 at Bletsoe together with his brother Beauchamp, MP.[2] [3] Apart from Beauchamp, four other brothers, Oliver, Rowland, Anthony and Alexander were to become MPs. [4]
In 1621 St John was elected Member of Parliament for Huntingdon. He was re-elected MP for Huntingdon in 1624 and again in 1625.[5]
St John died without issue.[1] His eldest brother Oliver inherited the Barony and became Earl of Bolingbroke.