Mizuno Tadatomo (水野 忠友, 1731–1802) was a Japanese samurai of the Edo period.
[1] From 3 November 1871 to 3 May 1788, he was a senior counselor (rōjū) at the top of the shōgun's hierarchy.
[2] In the political struggles of his time, he was a member of the faction headed by Tanuma Okitsugu.
[3] He managed to survive Tanuma's downfall; and he worked for a time with Matsudaira Sadanobu.
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