Akagi means (赤城) "red castle," (赤木) "red tree," or (赤来) "red future" in the
Japanese language, and may refer to:
- Mount Akagi, a volcano in the Kantō region of Japan
- Akagi, Gunma, a village in Gunma Prefecture
- Akagi, Shimane (赤来町), a former town in Shimane Prefecture
- Kei Akagi, a jazz pianist
- Akagi (manga), a manga by Nobuyuki Fukumoto
- Takenori Akagi and Haruko Akagi, two sibling characters from the basketball manga and anime Slam Dunk (manga)
- Dr. Ritsuko Akagi, a character from the anime TV series Neon Genesis Evangelion
- One of two ships of the Imperial Japanese Navy:
- Akagi (train), a Japan train name