Christopher John Rocco, simply known as John Rocco is an American illustrator of book covers and children's books. He is best known for illustrating the covers of books in the Percy Jackson & the Olympians series. He is the sole creator of some children's picture books.

Percy Jackson & the Olympians is a series of fantasy novels written by American author Rick Riordan. The first book series in his Camp Half-Blood Chronicles, the novels are set in a world with the Greek gods in the 21st century. The series follows the protagonist Percy Jackson, a young demigod, who must prevent the Titans, led by Kronos, from destroying the world.