Hirotaka Koishi

{{short description|Japanese baseball player}}

{{Infobox NPB player

|name=Hirotaka Koishi

|image=20120310 Hirotaka Koisi pitcher of the Saitama Seibu Lions, at Seibu Dome.JPG

|image_size=200px

|caption=

|position=Pitcher

|team=

|number=

|bats=Left

|throws=Left

|birth_date={{Birth date and age|1987|4|13}}

|birth_place=Hayami District, Ōita, Japan

|debutdate=April 26

|debutyear=2012

|debutteam=Saitama Seibu Lions

| statyear = 2016 season

| statleague = NPB

| stat1label = Win–loss record

| stat1value = 1–5

| stat2label = Saves

| stat2value = 1

| stat3label = ERA

| stat3value = 4.61

| stat4label = Strikeouts

| stat4value = 87

|teams=

• Saitama Seibu Lions ({{npby|2012}}–{{npby|2019}})

}}

{{nihongo|Hirotaka Koishi|小石 博孝|Koishi Hirotaka|extra=born April 13, 1993}} is a professional Japanese baseball player. He plays pitcher for the Saitama Seibu Lions.