Koji Oishi (born May 31, 1977) born in Japan is a mixed martial arts fighter. He competes in the Welterweight division. His last fight was a draw at Pancrase - Shining 3 against Shoji Maruyama on April 27, 2008.
| Career Statistics: | |
| Knockout Wins: 3 (08%) | Knockout Losses: 2 (06%) |
| TKO Wins: 2 (06%) | TKO Losses: 1 (03%) |
| Submission Wins: 0 (0%) | Submission Losses: 1 (03%) |
| Decision Wins: 16 (44%) | Decision Losses: 4 (11%) |
| Draws: 7 | No Contests: 0 |
| Career Fights: | |||||
| Opponent | Method | Event | Date | Rnd | |
| Win | Daisuke Hanazawa | Unanimous Decision | Pancrase: Impressive Tour 4 | May. 03, 2011 | 3 |
| Draw | Katsuhiko Nagata | Draw | Pancrase: Passion Tour 11 | Dec. 05, 2010 | 2 |
| Win | Isao Kobayashi | Unanimous Decision | Pancrase: Passion Tour 3 | Apr. 04, 2010 | 3 |
| Win | Felipe Olivieri | Decision | Pancrase: Changing Tour 4 | Aug. 08, 2009 | 2 |
| Win | Hyung Kwang Kim | Decision | Pancrase: Changing Tour 3 | Jun. 07, 2009 | 2 |
| Draw | Maximo Blanco | Draw | Pancrase: Changing Tour 2 | Apr. 05, 2009 | 2 |
| Loss | Katsuya Inoue | Unanimous Decision | Pancrase: Shining 10 | Dec. 07, 2008 | 3 |
| Win | Naoyuki Kotani | Unanimous Decision | Pancrase: Shining 8 | Oct. 01, 2008 | 3 |
| Draw | Shoji Maruyama | Draw | Pancrase: Shining 3 | Apr. 27, 2008 | 3 |
| Win | Karen Darabedyan | Unanimous Decision | PFP: Ring of Fire | Dec. 09, 2007 | 3 |
| Win | Chris Ade | Knockout | Bodog Fight: Vancouver | Aug. 25, 2007 | 3 |
| Loss | Katsuya Inoue | Knockout | Pancrase: Rising 5 | May. 30, 2007 | 2 |
| Win | Hiroyuki Nozawa | Technical Knockout | Pancrase: Blow 11 | Dec. 10, 2006 | 1 |
| Win | In Seok Kim | Knockout | Pancrase: Blow 9 | Oct. 25, 2006 | 1 |
| Loss | Carlos Condit | Technical Knockout | Pancrase: 2006 Neo-Blood Tournament Finals | Jul. 28, 2006 | 3 |
| Loss | Daizo Ishige | Decision | Pancrase: Blow 1 | Jan. 26, 2006 | 3 |
| Draw | Paul Rodriguez | Draw | Pancrase: Spiral 9 | Nov. 04, 2005 | 3 |
| Win | Nate Diaz | Unanimous Decision | Pancrase: 2005 Neo-Blood Tournament Finals | Aug. 27, 2005 | 3 |
| Loss | Nick Diaz | Knockout | UFC 53: Heavy Hitters | Jun. 04, 2005 | 1 |
| Win | Daisuke Hanazawa | Knockout | Pancrase: Spiral 3 | Apr. 10, 2005 | 3 |
| Loss | Hidehiko Hasegawa | Technical Submission | Pancrase: Brave 9 | Oct. 12, 2004 | 2 |
| Win | Masakazu Kuramochi | Technical Knockout | Pancrase: Brave 6 | Jun. 22, 2004 | 2 |
| Draw | Yuji Hoshino | Draw | Pancrase: Brave 4 | Apr. 23, 2004 | 3 |
| Draw | Heath Sims | Draw | Pancrase: Brave 1 | Feb. 06, 2004 | 3 |
| Win | Takahito Iida | Unanimous Decision | Pancrase: Hybrid 11 | Dec. 21, 2003 | 2 |
| Win | Takaichi Hirayama | Unanimous Decision | GCM: Demolition 030721 | Jul. 21, 2003 | 2 |
| Win | Daisuke Hanazawa | Unanimous Decision | Pancrase: Hybrid 5 | May. 18, 2003 | 2 |
| Win | Chris Lytle | Split Decision | Pancrase: Hybrid 4 | Apr. 12, 2003 | 3 |
| Draw | Takuya Wada | Draw | Pancrase: Hybrid 1 | Jan. 26, 2003 | 2 |
| Win | Juan Ayala | Unanimous Decision | Pancrase: Spirit 7 | Oct. 29, 2002 | 3 |
| Loss | Kiuma Kunioku | Unanimous Decision | Pancrase: 2002 Neo-Blood Tournament Opening Round | Jul. 28, 2002 | 3 |
| Win | Yoshimitsu Warita | Decision | Pancrase: Spirit 5 | May. 28, 2002 | 2 |
| Win | Satoru Kitaoka | Decision | Pancrase: Spirit 3 | Mar. 25, 2002 | 2 |
| Win | Takaharu Murahama | Decision | Deep: 3rd Impact | Dec. 23, 2001 | 3 |
| Win | Mick Green | Decision | Pancrase: Proof 6 | Oct. 30, 2001 | 2 |
| Loss | LaVerne Clark | Decision | UFC 25: Ultimate Japan 3 | Apr. 14, 2000 | 3 |
| Total Fights: 36 | Record: 21 - 8 (7 DRAWS) | |||||
Quarterly Rankings
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