Tobaku Mokushiroku Kaiji (賭博黙示録カイジ, Tobaku Mokushiroku Kaiji? lit. Gambling Apocalypse Kaiji) is a Japanese manga series about the art of gambling, written by Nobuyuki Fukumoto. It is published by Kodansha in Young Magazine. The first part of the manga (13 volumes), was adapted as a 26-episode anime television series called Kaiji (カイジ, Kaiji?), which began airing October 2007.
Tobaku Mokushiroku Kaiji is considered Fukumoto's most famous work, and is well known in both Japan and Korea. In 1998, it was the winner of the Kodansha Manga Award in the General category.