Perseus "Percy" Jackson is a fictional character, the title character and narrator of Rick Riordan's Percy Jackson & the Olympians series. He is also one of seven main protagonists of the sequel series The Heroes of Olympus, appearing in every book except The Lost Hero, and appears in the Trials of Apollo series, making him one of the few characters to appear in all three series of the Camp Half-Blood chronicles. He has also been a narrator and protagonist in Riordan's Greco-Roman/Egyptian crossover stories, part of the Demigods and Magicians collection. The character serves as the narrator in Percy Jackson's Greek Gods and Percy Jackson's Greek Heroes, also by Rick Riordan.

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.