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.


Random House reissued the book in 2018, in a slightly altered form that included Abby Cadabby, a character who debuted in 2006.