Other
- John Doe, generic name for a male whose identity is either unknown or withheld
- John, slang for a person who patronizes prostitutes
- John, slang for toilet
- John (ship), which disappeared off the coast of Australia in 1806
- Tropical Storm John (disambiguation), tropical cyclones appearing in the eastern Pacific Ocean
- John Peaks, mountains on Powell Island, Antarctica
- John the Ripper, a password strength checking program (the executable program is simply "john")
- John, a 1927 play by Philip Barry
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