J
- Jackal
- Jai "The Malachi Destroyer" Amin
- James Braddock
- James Hudson
- James Rupert "Jim" Rhodes
- Jane Foster
- Jarvis, Edwin
- Jeanne de Wolfe - dead
- Jennifer Walters
- Jessica Jones
- Jimmy Hudson
- John Ryker
- John Stacy - dead
- Jonah J.Jameson
- Juggernaut (Marko, Cain) - dead
- Justin Hammer - dead
Read more about this topic: List Of Ultimate Marvel Characters