K
- Kang the Conqueror in Avengers #8
- Karma in Marvel Team-Up #100
- Karnak in Fantastic Four #45
- Karnilla in Journey into Mystery #107
- Ka-Zar in X-Men #10
- Killer Shrike in Rampaging Hulk #1
- Kingpin in The Amazing Spider-Man #50
- Kitty Pryde in Uncanny X-Men #129
- Klaw in Fantastic Four #53
- Korvac in Giant-Size Defenders #1
- Kraven the Hunter in The Amazing Spider-Man #15
- The Kree in Fantastic Four #65
- Kro in Eternals #1
- Kurse in Thor #347
- Kylun in Excalibur]] #47
Read more about this topic: List Of First Appearances In Marvel Comics Publications