A Channel (Aチャンネル, Ē Channeru), is a Japanese four-panel comic strip by bb Kuroda. It was serialized from 2008 to 2021 in the seinen manga magazine Manga Time Kirara Carat, published by Houbunsha. A prequel manga series, also by Kuroda, launched in Manga Time Kirara Carino from January 2012. An anime adaptation by Studio Gokumi aired in Japan between April 8, 2011, and June 24, 2011. An original video animation, A Channel +smile, was released on March 21, 2012.

Adolescent girls Tooru Ichii and Run Momoki have been best friends since childhood. After passing her entrance exams, Tooru manages to enroll in the high school that Run is attending. Tooru decides to tell Run the news, only to come at a bad time and find her and her new classmate Yuko Nishi involved in an embarrassing situation, which makes things a bit awkward but funny on their first day of school, as Tooru begins fending off others who might show interest in Run while Yuko and another friend, Nagi Tennoji, start dealing with Run's own penchant for drama. As Run, Nagi and Yuuko begin their sophomore year while Tooru begins her freshman year, their high school life filled with drama, humor and adventure begins.