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- Lady Deathstrike in Alpha Flight #33
- The Lava Men in Journey into Mystery #97
- Leader in Tales to Astonish #62
- Leap-Frog in Daredevil #25
- Lilith in Ghost Rider #28
- Living Tribunal in Strange Tales #157
- Living Laser in Avengers #34
- Living Lightning in West Coast Avengers #63
- Lizard in The Amazing Spider-Man #6
- Lockheed in X-Men #166
- Lockjaw in Fantastic Four #45
- Loki in Journey into Mystery #85
- Longshot in Longshot #1
- Lord Chaos in Marvel Two-in-One #2
- Lorelei in Thor #337
- Lucifer in X-Men #9
- Luna in Fantastic Four #240
- Lyja in Fantastic Four #357
Read more about this topic: List Of First Appearances In Marvel Comics Publications