Saint Young Men (Seinto Oniisan) is a Japanese manga series written and illustrated by Hikaru Nakamura. Its plot involves Jesus Christ and Gautama Buddha, who are living as roommates in an apartment in Tokyo. It has been serialized by Kodansha in the monthly seinen manga magazine Morning 2 since September 2006, with chapters collected in ten tankōbon volumes as of May 2014. A-1 Pictures adapted the manga series into two original video animations (OVAs) and an anime film which was released on May 10, 2013.

Jesus Christ and Gautama Buddha, the founders of Christianity and Buddhism respectively, are living together as roommates in an apartment in Tachikawa, Tokyo, while taking a vacation on Earth. The comedy often involves jokes about Christianity, Buddhism, and the main characters' attempts to hide their identities and understand modern Japanese society. Each chapter shows their lives during an average day, and when they go sightseeing or visit amusement parks.