Others
- John Barlow (diplomat), English Tudor diplomat and spy
- John Barlow (clergyman) (1799–1869), Anglican clergyman and scientist
- John Barlow (entomologist) (1872–1944), American entomologist and college administrator
- John Barlow, New Zealander convicted of murdering businessmen Gene and Eugene Thomas
- John Barlow (novelist) (born 1967), English novelist
- John Brereton Barlow, physician, see Mitral prolapse
- John Noble Barlow (1861–1916), impressionist painter
- John Peleg Barlow (1918–1985), American oceanographer
- John Perry Barlow (born 1947), digital rights activist and former lyricist for the Grateful Dead
- John W. Barlow (1838–1914), career officer in the United States Army
- John Y. Barlow (1874–1949), Mormon fundamentalist and polygamist
- F. John Barlow, American businessman and mineral collector, see Barlow Planetarium
- Sir John Barlow, 1st Baronet of Slebetch (c. 1652–1695), of the Barlow baronets
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