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| Written by | Anna Ross |
| Illustrator | Joe Mathieu |
| Published | 1994 |
| Publisher | Random House |
| Series | A Chunky Flap Book |
| ISBN | 0679853049 |
Knock, Knock! Who's There? is a 1994 Sesame Street Chunky Flap Book. Readers can open the flaps to discover who's knocking.
Reissues[]
Random House reissued the book in 2018, in a slightly altered form that included Abby Cadabby, a character who debuted in 2006.
2018 reissue