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Knock Knock may refer to:
In-universe[[edit] | [edit source]]
Out-of-universe[[edit] | [edit source]]
- Knock Knock! (short story) by Paul Magrs, a short story published in the Doctor Who Storybook 2010
- Knock Knock (TV story), a 2015 episode of Doctor Who Series 10
- Knock! Knock! Who's There? (novel), a 2020 children's joke book