* The Lightning Thief
* The Sea of Monsters
* The Titan's Curse
* The Battle of the Labyrinth
* The Last Olympian
However, the Percy Jackson universe is far from over!
* The Heroes of Olympus series: This five-book series continues the story of Percy and his friends, featuring new characters and adventures.
* The Trials of Apollo series: This five-book series follows the god Apollo, who is stripped of his powers and forced to walk the earth as a mortal.
* The Kane Chronicles series: This three-book series follows the adventures of Sadie and Carter Kane, who discover they are descendants of Egyptian gods.
* Magnus Chase and the Gods of Asgard series: This three-book series follows Magnus Chase, a homeless teenager who discovers he is a son of Frey, the Norse god of light.
* The Demigod Diaries: This series consists of short stories featuring characters from the Percy Jackson universe.
While Rick Riordan hasn't announced any new books in the main Percy Jackson series, he is always writing and developing new stories within the world he has created. So, it's always possible we might see more Percy Jackson adventures in the future!