Seiya Hosokawa

{{short description|Japanese baseball player}}

{{Infobox NPB player

|name=Seiya Hosokawa

|image=Chunichi Dragons Seiya Hosokawa 20240420.jpg

|image_size=250px

|caption=Hosokawa with the Chunichi Dragons

|position=Outfielder

|team=Chunichi Dragons

|number=55

|bats=Right

|throws=Right

|birth_date={{Birth date and age|1998|8|4}}

|birth_place=Atsugi, Kanagawa, Japan

|debutleague=NPB

|debutdate=October 5

|debutyear=2017

|debutteam=Yokohama DeNA BayStars

|statyear=May 8, 2024

| stat1label=Batting average

| stat1value=.249

| stat2label=Home runs

| stat2value= 38

| stat3label=Runs batted in

| stat3value= 120

|teams=

• Yokohama DeNA BayStars ({{npby|2017}}–{{npby|2022}})
• Chunichi Dragons ({{npby|2023}}–present)

|awards=

• 2× NPB All-Star ({{npby|2023}}–{{npby|2024}})
• 1× Central League Best Nine Award (2024)

}}

{{nihongo|Seiya Hosokawa|細川 成也|Hosokawa Seiya|extra=born August 4, 1998}} is a Japanese professional baseball outfielder for the Chunichi Dragons of Nippon Professional Baseball (NPB). He has previously played in NPB for the Yokohama DeNA BayStars.