John Barclay
John Barclay may refer to:
Religion
- John Barclay (Berean), Scottish theological writer
- John Barclay (clergyman), Canadian Church of Scotland clergyman
- John M. G. Barclay, theologian and professor
Sports
- John Barclay (cricketer), English/Hong Kong cricketer
- John Barclay (rugby union), Scottish rugby union player
Others
- John Barclay (poet), Scottish satirist and Latin poet
- John Barclay (anatomist), Scottish anatomist
- John Barclay, Captain in Danish-Norwegian military, 1643 to 1645, thought to have been the first male member of Clan Barclay
- John Barclay (mayor), American soldier, politician, and jurist; mayor of Philadelphia in 1791
- John Barclay, survivor of the shipwreck of HMS Birkenhead in 1852
- John Barclay (Royal Marines officer), British Royal Marines general
- John Barclay (New Jersey politician), Scottish Quaker and politician