Hirotaka Koishi (小石 博孝, Koishi Hirotaka, born April 13, 1993) is a professional Japanese baseball player. He plays pitcher for the Saitama Seibu Lions.

Hirotaka Koishi
Pitcher
Born: (1987-04-13) April 13, 1987 (age 37)
Hayami District, Ōita, Japan
Bats: Left
Throws: Left
debut
April 26, 2012, for the Saitama Seibu Lions
NPB statistics
(through 2016 season)
Win–loss record1–5
Saves1
ERA4.61
Strikeouts87
Teams
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