is a 2009 children's picture book written by Amy Krouse Rosenthal and illustrated by Tom Lichtenheld.

Published by Chronicle Books, it follows two narrators as they debate whether an illustration is a picture of a duck or a rabbit.

In a New York Times article discussing some of Rosenthal's books Bruce Handy wrote "As for the wonderful “Duck!

Rabbit!” it is the funniest children’s book ever based on a 19th-century-style optical illusion (or more properly, the Internet tells me, “ambiguous figure”).".

[1] BookPage wrote "The text is easy and accessible for the earliest reader, but the ideas are intellectually satisfying for the adults who want to join the fun.