Akai Ko-en (Japanese: 赤い公園, Hepburn: Akai Kōen, meaning "Red Park") was a Japanese rock band formed in Tachikawa, Tokyo, in 2010. The original line-up consisted of Chiaki Satō, Maisa Tsuno, Hikari Fujimoto and Nao Utagawa. After Sato left the band in 2017, Riko Ishino joined as the new vocalist in 2018.

Most of Akai Ko-en's songs were written and composed by the leader of the band, Maisa Tsuno, with few exceptions. Their songs clearly show Tsuno's musical influences and range, going from complex compositions with the use of counterpoint and cross-rhythm to straightforward J-pop.

Following the death of Tsuno in 2020, the group disbanded on 28 May 2021.