| Koji Mitsui | |
|---|---|
 | |
| Pitcher | |
| Born: September 15, 1973 Ashoro, Hokkaido, Japan | |
Bats: Left Throws: Left | |
| Teams | |
| Career highlights and awards | |
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Koji Mitsui (三井 浩二, Mitsui Kōji, born September 15, 1973) is a Japanese retired professional baseball pitcher. He played in Nippon Professional Baseball for the Seibu / Saitama Seibu Lions from 2001 through 2009.