| Koichiro Koga | |
| Nationality: | Japanese |
| Birth Date: | 30 August 1984 |
| Birth Place: | Nagasaki, Japan[1] |
| Height: | 1710NaN0 |
| Weight: | 750NaN0 |
| Spike: | 3100NaN0 |
| Block: | 3000NaN0 |
| Position: | Libero |
| Currentclub: | Retired |
| Years1: | 2007–2009 |
| Team1: |  Wolf Dogs Nagoya |
| Years2: | 2009–2021 |
| Team2: | Toyoda Gosei Trefuerza |
| Nationalyears: | 2013–2016 |
| Nationalteam: | Japan |
| Medaltemplates-Expand: | set to "yes" to auto-expand medaltemplates section |
is a retired Japanese male volleyball player. He was a part of the Japan men's national volleyball team. On club level, he played for Toyoda Gosei Trefuerza and then Wolf Dogs Nagoya.[2]
His retirement was announced on March 7, 2021.[3]
Koga has younger brother, Taichiro Koga, who is a part of Japan men's national volleyball team as the same position.