John St. John may refer to:
Politicians Sir John St John (died 1302), English landowner, soldier, administrator and diplomat Sir John St. John (MP for Northamptonshire) (aft.1360–1424), MP for Northamptonshire in 1410, 1411, 1416, and 1421 Sir John St John (Bedfordshire MP) (bef. 1495–1558), MP for Bedfordshire, 1539, 1542 Sir John St. John (MP for Bletchingley) (died 1576), MP for Bletchingley in 1529 Sir John St John, 1st Baronet (1585–1648), MP for Wiltshire and prominent Royalist during the English Civil War John St John, 2nd Viscount St John (1702–1748), British politician, MP for Wootton Bassett John St John (died 1793) (1746–1793), MP for Newport, IoW 1773 and 1780 and Eye 1774–1780, Surveyor General of Crown Lands, 1775 John St. John (American politician) (1833–1916), governor of Kansas and a candidate for President of the United States John J. St. John (1857–1930), merchant and politician in Newfoundland Jack St. John (1906–1965), politician in Manitoba, Canada
Others John St John, 2nd Baron St John of Bletso (died 1596), English peer John P. St. John (police officer) (1918–1995), known as "Jigsaw John", American police officer and Los Angeles Police Department homicide detective John St. John, guitarist of Sounds Incorporated John St John, 11th Baron St John of Bletso (died 1757), British peer John St John, 12th Baron St John of Bletso (1725–1767), British peer John St John, 20th Baron St John of Bletso (1917–1976), English peer Ian St John (born John St John, 1938–2021), Scottish footballer
See also Jon St. John (born 1960), American voice actor and singer John of St John (died 1253), English-born clergyman in Ireland, bishop of Ferns St John (name)