B
- Badoon in Silver Surfer #2
- Balder in Journey into Mystery #85
- Banshee in X-Men #28
- Baron Mordo in Strange Tales #111
- Baron Zemo in Captain America #168
- Basilisk in Marvel Team-Up #16
- Batroc the Leaper in Tales of Suspense #75
- Baxter Building in Fantastic Four #3 (First named in #6)
- Beast in X-Men #1
- Beast (in furry form) in Amazing Adventures #11
- Dark Beast in X-Men: Alpha
- Ben Apps in Blue Oyster Adventures #1
- Ben Urich in Daredevil #153
- Beta Ray Bill in Thor #337
- Beyonder in Secret Wars #1
- Bishop in Uncanny X-Men #282
- Black Bolt in Fantastic Four #45
- Black Cat in The Amazing Spider-Man #194, July 1979
- Blackheart in Daredevil #270
- Black Knight
- I: as Sir Percy of Scandia in Black Knight Comics #1
- II: as Nathan Garrett in Tales to Astonish #52
- III: as Dane Whitman in The Avengers #47
- IV: (Vatican Black Knight) in The Black Panther #3
- Black Mamba in Marvel Two-in-One #64
- Blackout in Ghost Rider Vol.2 #2
- Black Panther in Fantastic Four #52
- Black Talon (original) in Strange Tales #173
- Black Widow
- I: as Claire Voyant in Mystic Comics #4
- II: as Natalia Romanova in Tales of Suspense #52
- III: as Yelena Belova in Inhumans (vol. 2) #5
- Blade in Tomb of Dracula #10
- BlackAxe in BlackAxe #1
- Blastaar in Fantastic Four #62
- Blink in X-Men: Alpha
- I: as Clarice Ferguson in Uncanny X-Men #317
- Blizzard
- I: as Jack Frost in Tales of Suspense #45
- II: in Iron Man #223
- Blob in X-Men #3
- BloodAxe in Thor #448
- Blood Brothers in Iron Man #55
- Bloodseed in Bloodseed #1
- Ulysses Bloodstone in Marvel Presents #1
- Elsa Bloodstone in Bloodstone #1
- Boomerang in Tales to Astonish #81
- Brood in Uncanny X-Men #155
- Brother Voodoo in Strange Tales #169
- Bullseye in Daredevil #131
Read more about this topic: List Of First Appearances In Marvel Comics Publications