Koji Shimizu (清水康次, Shimizu Kōji, born October 17, 1969) is a retired male long-distance runner from Japan. He set his personal best (2:08:28) in the men's marathon event on March 2, 2003 at the Lake Biwa Marathon.
International competitions
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
Representing  Japan | |||||
| 1997 | World Championships | Athens, Greece | 58th | Marathon | 2:37:11 |
| 1999 | World Championships | Seville, Spain | 7th | Marathon | 2:15:50 |
| 2002 | Asian Games | Busan, South Korea | 2nd | Marathon | 2:17:47 |
| 2003 | World Championships | Paris, France | 21st | Marathon | 2:13:19 |
Marathons
| Year | Competition | Venue | Position | Notes |
|---|---|---|---|---|
| 1997 | Tokyo Marathon | Tokyo, Japan | 1st | 2:10:09 |
| 1998 | Lake Biwa Marathon | Ōtsu, Japan | 3rd | 2:09:57 |
| 1999 | Tokyo Marathon | Tokyo, Japan | 3rd | 2:09:00 |
| 2000 | Tokyo Marathon | Tokyo, Japan | 8th | 2:10:41 |
| 2001 | Fukuoka Marathon | Fukuoka, Japan | 2nd | 2:09:28 |
| 2003 | Lake Biwa Marathon | Ōtsu, Japan | 4th | 2:08:28 |
