| Koichiro Nishi | |
| Native Name: | 西 興一朗 |
| Native Name Lang: | ja |
| Birth Date: | 17 October 1979 |
| Birth Place: | Ehime Prefecture, Japan |
| Years Active: | 2002-present |
| Occupation: | Actor |
| Height: | 178cm |
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.
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 . On May 5, 2015, he was married.
| Year | Title | Role | Network | Other notes |
|---|---|---|---|---|
| 2003 | Bakuryū Sentai Abaranger | Ryoga Hakua/Aba Red | Main Role | |
| 2009 | Tokyo Girl | Koji Toyota | Episode 3 | |
| Kamen Rider W | Kenji Kurata/Arms Dopant | TV Asahi | Episodes 15 and 16 | |
| 2012 | Ataru | Yoichi Mori | Episode 10 | |
| 2013 | Galileo | Episodes 10 and 11 | ||
| 2024 | Ultraman Arc | Hiroshi Ban | Main Role | |
| Year | Title | Role | Other notes | |
|---|---|---|---|---|
| 2003 | Ryoga Hakua/Aba Red | Main Role | ||
| 2004 | Bakuryū Sentai Abaranger vs. Hurricaneger | Ryoga Hakua/Aba Red | Main Role | |
| 2005 | Tokusou Sentai Dekaranger vs. Abaranger | Ryoga Hakua/Aba Red | Main Role | |
| 2007 | Carved | |||
| 2008 | Chameleon | |||
| 2014 | Ryoga Hakua/Aba Red |