Initial D (頭文字(イニシャル)D, Inisharu Dī?) is a manga by Shuichi Shigeno which has been serialized in Kodansha's Young Magazine since 1995.

The anime and manga focus on the world of illegal Japanese street racing, where all the action is concentrated in the mountain passes and never in cities nor urban areas, and the drift racing style is emphasized in particular. Keiichi Tsuchiya helps with editorial supervision. The story is centered around the Japanese prefecture of Gunma, more specifically on several mountains in the prefecture and in and their surrounding cities and towns. Although some of the names of the locations the characters race in have been fictionalized, all of the locations in the series are based on actual locations in Gunma Prefecture