Margret Elizabeth Rey was a German-born American writer and illustrator, best known for the Curious George series of children's picture books that she and her husband H. A. Rey created from 1939 to 1966.

Curious George is a fictional monkey who is the title character of a series of popular children's picture books written and illustrated by Margret and H. A. Rey. Various media, including films and TV shows, have been based upon the original book series.