Mizuno Tadamasa

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{{nihongo|Mizuno Tadamasa|水野 忠政|4=1493 – 22 August 1543}} was a Japanese samurai lord and daimyo of the Sengoku period. He was the father of Odai no Kata, the mother of shōgun Tokugawa Ieyasu. He was a member of the Mizuno clan.

In 1533, Mizuno Tadamasa built and ruled Kariya Castle.{{Cite web |title=Kariya Castle |url=https://jcastle.info/view/Kariya_Castle |access-date=2024-02-28 |website=Jcastle.info |language=en}} Tadamasa was the father of Mizuno Nobumoto and Mizuno Tadashige.