Seiji Miyaguchi
- Birth Date
 - 11/15/1913 - 4/12/1985
 - Birth Place
 - Tokyo, Japan
 - Known For
 - Acting
 

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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