St John Zachary[1] (meaning "St John, son of Zechariah", i.e. John the Baptist)[2] was a church, first mentioned in official records in 1181,[3] within the City of London, England, on the north side of Gresham Street, Aldersgate.

[4] Its vicar from 25 May 1424[5] to an unknown date was William Byngham, the founder of England's first teacher training college.

[6] It was destroyed in the Great Fire of London in 1666[7] and not rebuilt,[8] with its parish being united with that of St Anne and St Agnes[9] by Act of Parliament in 1670[10] –an arrangement that lasted until the 20th century.

[11] Its site is now a garden,[12] first made by the fire watchers in 1941.

[14] Sir Drugo Barentyn, (died 1415), Goldsmith, one of the Sheriffs of the City of London, twice Lord Mayor of London, politician, was buried there.