K
- Henry Kane (Poltergeist II: The Other Side) - Julian Beck
- Nikos Karamanlis (Antropophagus) - George Eastman
- Kat (Zombie Strippers) - Jenna Jameson
- Elly Kedward aka The Blair Witch (The Blair Witch Project)
- Junior Keller (The Unseen) - Stephen Furst
- David Kessler (An American Werewolf in London) - David Naughton
- Jeremiah Ketchum (The Amityville Horror)
- Laura Kincaid (The Incubus) - Kerrie Keane
- Mary Shelley and Vincent King (Hack!) - Juliet Landau and Sean Kanan
- Vance Kingsley (The Toolbox Murders) - Cameron Mitchell
- Leena Klammer (Orphan) - Isabelle Fuhrman
- Knobby (Fear) - Jed Rees
- Mallory and Mickey Knox (Natural Born Killers) - Juliette Lewis and Woody Harrelson
- Donald Kohler (Don't Go in the House) - Dan Grimaldi
- Robert Kraft (I Bury the Living) - Richard Boone
- John Kramer aka Jigsaw (Saw) - Tobin Bell
- Cyrus Kriticos (Thirteen Ghosts) - F. Murray Abraham
- Freddy Krueger aka The Springwood Slasher (A Nightmare on Elm Street and its sequels) - Robert Englund
- Freddy Krueger aka The Springwood Slasher (A Nightmare on Elm Street) - Jackie Earle Haley
- Ryan Kuhn aka The Jackal (Thirteen Ghosts)
- Kyle (Lost Boys: The Tribe) - Shaun Sipos
- Kayakeo Saeki (The Grudge)
Read more about this topic: List Of Horror Film Antagonists