FitzJohn was a bus manufacturer in Muskegon, Michigan, United States.

FitzJohn, Fitzjohn, Fitz-John, or Fitz John may also refer to:

Modern surname

• Gavin Fitzjohn, member of Welsh band Adequate Seven
• Tony Fitzjohn (1945–2022), British conservationist in Africa
• Val Fitzjohn (1878–1934), Scottish professional golfer
• William Henry Fitzjohn (1915–1989), Sierra Leonean churchman, educator and diplomat

Medieval patronymic

• Children of John fitzRichard, one of William the Conqueror's supporters; including:
  • Pain fitzJohn (died 1137)
  • Eustace fitz John (died 1157)
• Roger FitzJohn (died 1248/1249), Lord of Clavering, Warkworth and Horsford; son of John FitzRobert and Ada de Baillol
• Children of John Fitzgeoffrey (1205?–1258) Lord of Shere and Justiciar of Ireland; including:
  • John FitzJohn of Shere (died 1275)
  • Richard FitzJohn of Shere (died 1297)
  • Maud FitzJohn, Countess of Warwick (died 1301)
• William FitzJohn (died 1326) Archbishop of Cashel and Lord Chancellor of Ireland.
• Thomas FitzJohn (died 1328), 2nd Earl of Kildare, Lord Offaly
• The 1st, 7th, and 9th Knight of Kerry
• John Fitz-John, Archdeacon of Totnes
• Walter Blake fitz John (died 1508), Bishop of Clonmacnoise, Ireland
• Dominick Lynch fitz John, Mayor (1548–9) of Galway, Ireland

Given name

• Fitz John Porter (1822–1901) United States Army officer and a Union general during the American Civil War
• Fitz-John Winthrop (1637–1707), governor of the Colony of Connecticut

• Fitzjohns Avenue, a street in Hampstead, London
• Fitzjohn's Primary School, community primary school in Hampstead, London, UK.