S
- Sabra
- Sabretooth (Creed, Victor)
- Saluki (unknown)
- Samual Sterns
- Sandman (Marko, Flint)
- Sasquatch
- Sam Bullit
- Scarlet Witch (Lensherr, Wanda)
- Schizoid Man (unknown)- dead
- Scorpion (clone of Peter Parker)-Status unknown
- Sentinels
- Sentry
- Shadowcat (Pryde, Kitty)
- Shang-Chi
- Shaman (comics)
- S.H.I.E.L.D
- Shinobi Shaw
- Shape (Squadron Supreme)
- Sharon Carter
- Sky-Eater
- Skrull
- Sebastian Shaw - dead
- Spider-Girl (Parker,May)
- Spider-Man (Parker, Peter Benjamin)
- Spider-Woman (Drew, Jessica)
- Shocker
- Storm
Read more about this topic: List Of Ultimate Marvel Characters