| Seiya Hosokawa | |
| Position: | Outfielder |
| Team: | Chunichi Dragons |
| Number: | 55 |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 4 August 1998 |
| 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 |
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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.
On 9 December 2022, Hosokawa was traded to the Chunichi Dragons for Shōtarō Kasahara in the 2022 Current Player Draft.[1]