Kazunari Koga (古賀 一成, Koga Kazunari, born April 17, 1972) 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.
This biographical article related to a Japanese association football midfielder born in the 1970s is a stub.