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Blue Flag (Japanese: 青のフラッグ, Hepburn: Ao no Furaggu) is a Japanese manga series written and illustrated by KAITO. It was serialized on the Shōnen Jump+ manga website from February 2017 to April 2020.

The series is written and illustrated by KAITO. It started serialization on the Shōnen Jump+ manga website on February 1, 2017, and ended on April 8, 2020. It has been published in eight tankōbon volumes.

At Anime Expo 2019, Viz Media announced they licensed the series in English. Manga Plus also published the series in English. It is also licensed in French by Kurokawa, in German by Carlsen Verlag, in Italian and Portuguese by Panini Comics, and in Spanish by Editorial Ivrea.