Henry St. John may refer to:
Henry St John (MP for Stockbridge) (c. 1568–1621), MP for Stockbridge, 1589 and 1593 Sir Henry St John (MP for Huntingdon) (fl. 1621–25), English politician Sir Henry St John, 1st Viscount St John (1652–1742), father of the 1st Viscount Bolingbroke and MP for Wootton Bassett, 1679–1700 Henry St John, 1st Viscount Bolingbroke (1678–1751), English philosopher and MP for Wootton Bassett, 1701–1708 Sir Henry St John, 2nd Baronet (1737–1784), British politician Henry St John (British Army officer) (1738–1818), MP for Wootton Bassett, 1761 and 1802 Henry St John, 13th Baron St John of Bletso (1758–1805), British peer Henry St. John (Ohio politician) (1783–1869), American politician from Ohio Henry St John, 4th Viscount Bolingbroke, 5th Viscount St John (1786–1851) Henry St John, 5th Viscount Bolingbroke, 6th Viscount St John (1820–1899) Henry St John (Royal Navy officer) (1837–1909), British admiral Henry St John, 18th Baron St John of Bletso (1876–1920), English peer
See also Henry St John-Mildmay (disambiguation) Henry St. John Cooper (1869–1926), English author John Creasey (1908–1973), who used the pen name Henry St. John Cooper Viscount Bolingbroke, for several other Viscounts Bolingbroke named Henry St John