People
- J. B.
- J. B. L.
- J. Heywood
- J. O.
- J.R.
- Jack
- Jack Strike (fictional)
- James Bowker
- James Bruce
- James Hargreaves
- James Murray Mason
- James Ross
- James Ward
- James Watt
- Jamie
- Jammie O' Ned's
- Jefferson Davis
- Jefferson Davis
- Jem Thompson
- Jesus Christ (deity)
- Jim
- Jim
- Jim
- Jim Bell
- Jimmy
- Job
- Joe
- Joey
- John
- John
- John
- John Adams
- John Arthur Roebuck
- John Barleycorn (personification)
- John Baron
- John Breckinridge
- John Bright
- John Brown (fictional)
- John Bull (personification)
- John Charles Twist
- John Cheetham
- John Cumming
- John Floyd
- John Franklin
- John Hampden
- John Jay
- John Keats
- John Letcher
- John Magruder
- John Merryman
- John Milton
- John Osbaldeston
- John Parry
- John Plummer
- John Prince
- John Pym
- John Slidell
- John Wilkes
- Jonathan (personification)
- Jone
- Jonny McKay
- Joseph Eggleston Johnston
- Joseph Ramsbottom
- Jove (deity)