School Days (スクールデイズ, Sukūru Deizu) is an animation adventure game developed by 0verflow and was first released on April 28, 2005. The original version, made for the PC, contains Eroge. An all-ages version was later released on January 17, 2008 for the PlayStation 2.

The game is known for its “bad” endings, with contents ranging from the murder of the main characters, to graphic depictions of suicide. A spin-off of the game, Summer Days, was released by 0verflow using the same system, but with such contents removed.

School Days has made several transitions into other media, including a twelve-episode anime created by TNK, and two OVAs by the same studio, a manga series, three novels, and a drama CD.