John Armstrong
- Armstrong, John (d.1528), of Gilnockie, a famous freebooter of the border-country
- Armstrong, John (1673-1742), F.R.S., Chief Engineer of England
- Armstrong, John (1709-1779), poet, physician, and essayist
- Armstrong, John (1771-1797), journalist and writer of verses, was born at Leith
- Armstrong, John (1784-1829), senior, physician
- Armstrong, John (1813-1856), junior, bishop of Grahamstown
- Authors
- John Armstrong (1709–1779), Scottish poet and physician
- John Armstrong (1813–1856), English clergyman