Attack on Titan 'The Advancing Giant'  is a Japanese manga series written and illustrated by Hajime Isayama. Set in a world where humanity is forced to live in cities surrounded by three enormous walls that protect them from gigantic man-eating humanoids referred to as Titans, the story follows Eren Yeager, an adolescent boy who vows to exterminate the Titans after they bring about the destruction of his hometown and the death of his mother. It was serialized in Kodansha's monthly magazine Bessatsu Shōnen Magazine from September 2009 to April 2021, with its chapters collected in 34 tankōbon volumes.

Attack on Titan has been met with widespread critical and commercial success. By November 2023, the manga had over 140 million copies in circulation, making it one of the best-selling manga series of all time. It has won several awards, including the Kodansha Manga Award, the Attilio Micheluzzi Award, and the Harvey Award.