Seiji Miyaguchi (宮口 精二 Miyaguchi Seiji, November 15, 1913–April 12, 1985) was a Japanese actor who appeared in such films as Akira Kurosawa's Seven Samurai (as Kyuzo, the master swordsman) despite the actor's confession to have never handled a sword before the role, Ikiru as a yakuza boss from "restaurant row," and Masaki Kobayashi's Kwaidan. He died of lung cancer.

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