Akagi (written: lit. "red castle" or lit. "red tree") is a Japanese surname. Notable people with the surname include:

, Japanese sprint canoeist , Japanese-American jazz pianist , Japanese actor , Japanese politician , Japanese voice actor Hirofumi Akagi, Japanese electrical engineer, professor

Fictional characters , character from the anime television series Neon Genesis Evangelion Takenori Akagi (赤木 剛憲) and Haruko Akagi (赤木 晴子), two sibling characters from the basketball manga and anime Slam Dunk Daidoji Akagi, character and card personality in the L5R games and setting , character from Denshi Sentai Denjiman , character from Unofficial Sentai Akibaranger Ryan Akagi, character from Infinity Train , the main character from the manga Akagi (manga)