Peter Sís
- Birthday: 1949-05-11
- Place of birth: Brno, Czechoslovakia
- Also know as: Petr Sís
Peter Sís is a Czech-born American illustrator and writer of children's books. As a cartoonist his editorial illustrations have appeared in Time, Newsweek, Esquire, and The Atlantic Monthly. In 2012 he received the Hans Christian Andersen Medal for his "lasting contribution" as an illustrator of children's literature.
