John Weir

John Weir may refer to:
 * John Alexander Weir (1894–1942), Canadian lawyer and professor
 * John Angus Weir (1930–2007), fourth president of Wilfrid Laurier University
 * John Ferguson Weir (1841–1926), American painter and sculptor
 * John Jenner Weir (1822–1894), English amateur entomologist, ornithologist and British civil servant
 * John Weir (loyalist) (born 1950), Ulster loyalist
 * Johnny Weir (born 1984), American figure skater
 * John Weir (footballer), Scottish footballer
 * John Weir (writer) (born 1959), American writer
 * John Weir (geologist) (1896–1978), Scottish geologist and palaeontologist
 * John Weir (physician) (1879–1971), Physician Royal to several British monarchs
 * John Weir (politician) (1904–1995), Australian politician
 * John Weir (trade unionist) (1851–1908), Scottish trade unionist