Seiya Hosokawa (細川 成也, Hosokawa Seiya, 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.

On 9 December 2022, Hosokawa was traded to the Chunichi Dragons for Shōtarō Kasahara in the 2022 Current Player Draft.

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