Mad Jack
- Charles Howard, 20th Earl of Suffolk
- Donkey Kong 64
- Jack Churchill
- Jack O'Lantern (Marvel Comics)
- John Byron (British Army officer)
- John Mytton
- John Percival
- List of Samurai Jack episodes
- Mad Jack Fuller
- Mad Jack Hall
- Mad Jack the Pirate
- Samurai Jack
- Samurai Jack (character)
- Samurai Jack season 5
- Siegfried Sassoon