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- Paladin(Marc Spector)
- Penultimate
- Pepper Potts
- Perun (unknown)
- Pete Wisdom
- Phil Coulson
- Phoenix Force
- Phoebe McAllister
- Piledriver
- Polaris (Dane, Lorna)(dead)
- Power Man (Cage, Luke)
- Power Princess (Squadron Supreme)
- Primal Screamer
- Princess Python
- The Principal (Jones, Larry)
- Prowler
- Prosimian (unknown)
- Proteus (Xavier, David) (dead)
- Psycho-Man
- Psylocke (Braddock, Elisabeth "Betsy")
- Punisher (Castle, Frank)
- Pyro (unknown)
Read more about this topic: List Of Ultimate Marvel Characters