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- Karen Allen (born 1951), American actress
- Kate Allen, several people
- Keith Allen (born 1953), Welsh comedian, actor and writer
- Kenneth Allen, several people
- Kenton Allen, television producer at BBC
- Kevin Allen, several people
- Kris Allen (born 1985), American singer-songwriter and winner of 'American Idol
- Krista Allen (born 1971), American actress and model
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