John St. John
John St. John may refer to:
- Sir John St John, 1st Baronet (1585–1648), of Lydiard Park in Wiltshire, Member of Parliament (MP) and prominent Royalist during the English Civil War
- John St John, 2nd Baron St John of Bletso (died 1596), English peer
- John St. John (Governor of Kansas) (1833–1916), eighth Governor of Kansas and a candidate for President of the United States
- John P. St. John (detective) (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 (died 1793) (c.1746–1793), MP for Eye 1774–1780, Midhurst and Newport
- John St John, 11th Baron St John of Bletso (died 1757), British peer
- John St John, 12th Baron St John of Bletso (died 1767), British peer
- John St John, 20th Baron St John of Bletso (1917–1976), English peer
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