Koichi Sato (佐藤 浩市 Satō Kōichi, born December 10, 1960) is a Japanese actor. He is the son of veteran Japanese actor Rentarō Mikuni.

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Koichi Sato is a prominent Japanese film actor and the son of veteran actor Rentarō Mikuni, known for extensive work across Japanese drama and action cinema.
He is recognized for major roles in When the Last Sword Is Drawn, the Kingdom film franchise, and Mishima: A Life in Four Chapters.
He features in a diverse range of genres including historical jidai-geki dramas, action blockbusters, crime thrillers, and arthouse projects.