Torii Tadamasa (鳥居 忠政, 1567 – October 2, 1628) was a Japanese Samurai and Daimyo of the Edo period, who served Tokugawa Shogunate. He was a son of Torii Mototada, a retainer of Tokugawa Ieyasu.

In 1603, following the Battle of Sekigahara, he become the first lord (daimyō) of Iwakitaira Domain in Japan's Mutsu Province, worth 100,000 koku.

In 1622, he was moved to the larger fief of Yamagata in Dewa Province, worth 260,000 koku.

This article incorporates text from OpenHistory.