Billy Bat (ビリーバット, Birii Batto) is an ongoing Japanese seinen thriller manga series written by Naoki Urasawa and Takashi Nagasaki and illustrated by Urasawa. The series was announced in issue 45 of the Japanese manga anthology Weekly Morning in 2008, and its first chapter was released in the next issue of Morning on October 16, 2008. Kodansha is collecting the individual chapters into tankōbon volumes, and has released twelve volumes so far, on August 23, 2013.