John Weir
John Weir may refer to:
- John Alexander Weir, Canadian lawyer and professor
- John Angus Weir, fourth president of Wilfrid Laurier University
- John Ferguson Weir, American painter and sculptor
- John Jenner Weir, English amateur entomologist, ornithologist and British civil servant
- John Weir (loyalist), Ulster loyalist
- Johnny Weir, American figure skater
- John Weir (footballer), Scottish footballer
- John Weir (writer), American writer
- John Weir (geologist), Scottish geologist and palaeontologist
- John Weir (physician), Physician Royal to several British monarchs
- John Weir (politician), Australian politician
- John Weir (trade unionist), Scottish trade unionist