| Kazunari Koga 古賀 一成 | |
| Fullname: | Kazunari Koga |
| Birth Date: | 17 April 1972 |
| Birth Place: | Shizuoka, Japan |
| Position: | Midfielder |
| Youthyears1: | 1988–1990 |
| Youthclubs1: | Tokai University Daigo High School |
| Youthyears2: | 1991–1994 |
| Youthclubs2: | Osaka University of Commerce |
| Years1: | 1995–1999 |
| Clubs1: | Cerezo Osaka |
| Caps1: | 41 |
| Goals1: | 1 |
| Totalcaps: | 41 |
| Totalgoals: | 1 |
is a former Japanese football player.
Koga was born in Shizuoka Prefecture on April 17, 1972. After graduating from Osaka University of Commerce, he joined the newly promoted J1 League club, Cerezo Osaka in 1995. He played in many matches as defensive midfielder. However he did not play as much in 1998 and retired at the end of the 1999 season.
| Club performance | League | Cup | League Cup | Total | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Club | League | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | |
| Japan | League | Emperor's Cup | J.League Cup | Total | |||||||
| 1995 | Cerezo Osaka | J1 League | 6 | 0 | 0 | 0 | colspan="2" | - | 6 | 0 | |
| 1996 | 23 | 1 | 2 | 0 | 5 | 0 | 30 | 1 | |||
| 1997 | 11 | 0 | 0 | 0 | 6 | 0 | 17 | 0 | |||
| 1998 | 1 | 0 | 1 | 0 | 2 | 0 | |||||
| 1999 | 0 | 0 | 0 | 0 | 0 | 0 | |||||
| Total | 41 | 1 | 2 | 0 | 12 | 0 | 55 | 1 | |||