Sakai Tadatoshi (酒井 忠利, 1562–1627) was a Japanese samurai daimyō of the Edo period.
He was head of a cadet branch of the Sakai clan.
[1] In 1601, Tadatoshi was made head of Tanaka Domain (10,000 koku) in Suruga Province.
His holdings were transferred in 1609 to Kawagoe Domain (30,000 koku) in Musashi Province.
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