Cross Game is a Japanese baseball-themed manga series written and illustrated by Mitsuru Adachi. It was serialized in Shogakukan shōnen manga magazine Weekly Shōnen Sunday from April 2005 to February 2010, with its chapters collected in 17 tankōbon volumes. The series was adapted as a 50-episode anime television series that aired on the TV Tokyo network from April 2009 to March 2010.

In Japan, Kōshien (甲子園) generally refers to the two annual baseball tournaments played by high schools nationwide culminating at a final showdown at Hanshin Kōshien Stadium in Nishinomiya, Hyogo, Japan. They are organized by the Japan High School Baseball Federation in association with Mainichi Shimbun for the National High School Baseball Invitational Tournament in the spring and Asahi Shimbun for the National High School Baseball Championship in the summer.