Others
- John Barnes (monk) (died 1661), Benedictine monk
- John Andrew Barnes, III (1945–1967), U.S. Army Medal of Honor recipient
- John Barnes (computer scientist), programming language designer
- John Barnes (musician) (born 1932), jazz saxophonist and clarinetist
- John Barnes, 5th Baron Gorell (born 1959), British chartered surveyor
- Johnny Barnes (born 1924), Bermudian eccentric
- John Arundel Barnes (1918–2010), Australian and British social anthropologist
- John Sanford Barnes (1836–1911), United States Navy officer
- J. Mahlon Barnes (1866–1934), American trade union functionary and socialist political activist
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