Akagi means (赤城) "red castle," (赤木) "red tree," or (赤来) "red future" in the Japanese language, and may refer to:

• Akagi, Gunma, a village in Gunma Prefecture
• Akagi, Shimane (赤来町), a former town in Shimane Prefecture
• Akagi (manga), a manga by Nobuyuki Fukumoto
• Akagi (surname), a Japanese surname
• Akagi (train), a train service in Japan
• "Akagi", a song performed by Maximum the Hormone
• One of two ships of the Imperial Japanese Navy:
  • Japanese gunboat Akagi, which served in the Sino-Japanese War
  • Japanese aircraft carrier Akagi, which served in World War II
• Mount Akagi, a mountain in the Kantō region of Japan

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