| Koji Seki 関 浩二 | |
| Fullname: | Koji Seki |
| Birth Date: | 26 June 1972 |
| Birth Place: | Ome, Tokyo, Japan |
| Position: | Forward |
| Youthyears1: | 1988–1990 |
| Youthclubs1: | Yomiuri |
| Years1: | 1990–1993 |
| Clubs1: | Verdy Kawasaki |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 1994–1995 |
| Clubs2: | Tokyo Gas |
| Caps2: | 53 |
| Goals2: | 40 |
| Years3: | 1996–1998 |
| Clubs3: | Bellmare Hiratsuka |
| Caps3: | 44 |
| Goals3: | 7 |
| Years4: | 1998 |
| Clubs4: | Tokyo Gas |
| Caps4: | 6 |
| Goals4: | 0 |
| Years5: | 1998–1999 |
| Clubs5: | Consadole Sapporo |
| Caps5: | 29 |
| Goals5: | 6 |
| Totalcaps: | 132 |
| Totalgoals: | 53 |
is a former Japanese football player.
Seki was born in Ome on June 26, 1972. He joined Yomiuri (later Verdy Kawasaki) from youth team in 1990. However he could not play at all in the match. In 1994, he moved to Japan Football League club Tokyo Gas. He played as regular forward and scored many goals with Amaral. In 1996, he moved to Bellmare Hiratsuka. In June 1998, he returned to Tokyo Gas. In October 1998, he moved to Consadole Sapporo which performance was bad. However the club was relegated to J2 League end of 1998 season. He retired end of 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 | |||||||
| 1990/91 | Yomiuri | JSL Division 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 1991/92 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
| 1992 | Verdy Kawasaki | J1 League | colspan=2 | - | 0 | 0 | 0 | 0 | 0 | 0 | |
| 1993 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
| 1994 | Tokyo Gas | Football League | 26 | 15 | 3 | 1 | colspan=2 | - | 29 | 16 | |
| 1995 | 27 | 25 | 1 | 0 | colspan=2 | - | 28 | 25 | |||
| 1996 | Bellmare Hiratsuka | J1 League | 21 | 6 | 3 | 1 | 15 | 8 | 39 | 15 | |
| 1997 | 16 | 1 | 3 | 2 | 2 | 0 | 21 | 3 | |||
| 1998 | 7 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | |||
| 1998 | Tokyo Gas | Football League | 6 | 0 | 0 | 0 | colspan=2 | - | 6 | 0 | |
| 1998 | Consadole Sapporo | J1 League | 4 | 0 | 3 | 2 | 0 | 0 | 7 | 2 | |
| 1999 | J2 League | 25 | 6 | 2 | 1 | 1 | 0 | 28 | 7 | ||
| Total | 132 | 53 | 15 | 7 | 18 | 8 | 165 | 68 | |||