John Armstrong may refer to:
- John Armstrong (journalist/poet) (1771–1797), Scottish journalist and poet
- John Armstrong (physician) (1784–1829), English physician
- John Alexander Macdonald Armstrong (1877–1926), Canadian politician
- John Armstrong (Australian politician) (1908–1977), Australian politician and federal minister
- John Armstrong (archbishop of Armagh) (1915–1987), Anglican bishop
- John Armstrong (bishop of Grahamstown) (1813–1856), Anglican bishop
- John Armstrong (bishop of Bermuda) (1905–1992), Anglican bishop
- John Armstrong (British writer/philosopher) (born 1966), British writer and philosopher
- John Armstrong (Carolina) (1735–c. 1784), American soldier and developer from North Carolina
- John Armstrong (comics), British comics artist
- John Armstrong (cricketer) (born 1981), English cricketer
- John Armstrong (footballer born 1936), former professional footballer
- John Armstrong (footballer) (born 1988), Scottish soccer player
- John Armstrong (frontiersman) (1755–1816), American soldier from Pennsylvania and Ohio
- John Armstrong (ice hockey) (born 1988), Canadian professional ice hockey player
- John Armstrong (model railroader) (1920–2004), American modeller
- John Armstrong (New Zealand politician) (born 1935), New Zealand Member of Parliament 1990–1993
- John Armstrong (poet) (1709–1779), Scottish poet
- John Armstrong (rugby league), Australian rugby league footballer
- John Armstrong (British Army officer) (1674–1742), British Surveyor General
- John Armstrong, Jr. (1758–1843), American soldier, congressman, and U.S. Secretary of War
- John Armstrong, Sr. (1717–1795), American general and Continental Congressman
- John Barclay Armstrong (1850–1913), Texas Ranger and U.S. marshal
- John S. Armstrong, founder of Highland Park, Texas and co-founder of Oak Cliff
- John Armstrong (of Carrick) (1929- c.1980), farmer, huntsman, stick dresser and traditional musician from Northumberland
- John Archibald Armstrong (1917–2010), Canadian business executive
- Johnny Armstrong (1898–1960), American football player
Famous quotes containing the words john and/or armstrong:
“Despite everybody who has been born and has died, the world has just gone on. I mean, look at Napoleon—but we went right on. Look at Harpo Marx—the world went around, it didn’t stop for a second. It’s sad but true. John Kennedy, right?”
—Bob Dylan [Robert Allen Zimmerman] (b. 1941)
“But Jonnë had a bright sword by his side,
And it was made of the mettle so free,
That had not the king stept his foot aside,
He had smitten his head from his faire bodde.”
—Unknown. Johnie Armstrong (l. 45–48)