G
- Gaea in Doctor Strange #6
- Galactus in Fantastic Four #48
- Gambit in Uncanny X-Men #266
- Gamora in Strange Tales #180
- Gardener in Marvel Team-Up #55
- Gargantus in Tales of Suspense #40
- Geirrodur in Journey into Mystery #101
- Ghaur in Eternals (vol. 2) #2
- Ghost Rider
- as John "Johnny" Blaze in Marvel Spotlight #5
- as Danny Ketch in Ghost Rider (vol. 2) #1
- Gideon in New Mutants #98
- Glob in Incredible Hulk #121
- Glorian in Incredible Hulk #191
- Goddess in Infinity War #6
- Gorgon in Fantastic Four #44
- Gravity in Gravity #1
- Green Goblin
- as Norman Osborn II in The Amazing Spider-Man #14
- as Harold (Harry) Osborn in The Amazing Spider-Man #136
- Gremlin in Incredible Hulk #163
- Grey Gargoyle in Journey into Mystery #107
- Grim Reaper in Avengers #52
- Gwen Stacy in The Amazing Spider-Man #31
Read more about this topic: List Of First Appearances In Marvel Comics Publications