Another is a Japanese mystery horror novel by Yukito Ayatsuji, published on October 29, 2009 by Kadokawa Shoten. The story focuses on a boy named Kōichi Sakakibara who, upon transferring into Yomiyama Middle School and meeting the curious Mei Misaki, finds himself in a mystery revolving around students and people related to his class falling victim to gruesome, senseless deaths.

A manga adaptation by Hiro Kiyohara was serialized between May 2010 and January 2012 in the issues of Kadokawa Shoten's Young Ace. Both the novel and the manga have been licensed in North America by Yen Press. A 12-episode anime television series produced by P.A. Works aired in Japan between January 10 and March 27, 2012, with an original video animation episode released on May 26, 2012, and a live-action film of the same name was released in Japanese theatres on August 4, 2012.