- A killer is a person, animal, object, plant (&c.) that kills. See also assassin; murder.
- A killer is the lines, bars, grid, etc. applied to stamps on a letter to prevent their reuse (see also cancellation).
- Killer is a live action role-playing game by Steve Jackson Games where players play assassins who "kill" one another.
- Killer is the name of a 1980s UK psychobilly band.
- Killer is the name of the second successful Alice Cooper album, released in 1971.
- Jerry Lee Lewis is nicknamed "the Killer."
- Killer is the name of a Finnish pop band.
This disambiguation page lists articles associated with the title Killer.
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