Fumiya Nishiguchi (西口 文也, Nishiguchi Fumiya), (born September 26, 1972) is a Japanese former professional baseball right-handed pitcher and current manager for the Saitama Seibu Lions of Nippon Professional Baseball (NPB).

He played 21 seasons in NPB, all for the Lions.

On September 23, 2024, Nishiguchi was announced as the new manager for the Saitama Seibu Lions.

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