Koichiro Nishi (西 興一朗, Nishi Kōichirō, born October 17, 1979 in Ehime Prefecture[1]) is a Japanese actor who is affiliated with CES.

He played the role of Ryoga Hakua (Aba Red) in the 2003 Super Sentai TV series Bakuryū Sentai Abaranger.

[1] Nishi debuted as a model in 2002.

In 2003, he starred in Bakuryū Sentai Abaranger as Ryoga Hakua/Aba Red.

In 2014, Nishi reprised that role in Zyuden Sentai Kyoryuger vs. Go-Busters: The Great Dinosaur Battle!