F
- Falcon (Wilson, Sam)
- Fancy Dan (Rubenstein, Dan)
- Fandral
- Fenris (von Strucker, Andrea and Andreas) - dead
- Filament
- Firepower
- Firestar (Allen, Elizabeth "Liz")
- Forge (unknown) - dead
- Fountain
- Franklin "Foggy" Nelson
- Franklin Richards
- Franklin Storm
- Fred "Flash" Thompson
- Fury
Read more about this topic: List Of Ultimate Marvel Characters