Toda Tadamasa (戸田 忠昌, 1632 – October 2, 1699) was a Japanese daimyō of the early Edo period. He served in a variety of positions in the Tokugawa shogunate, including rōjū and Kyoto Shoshidai.

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Preceded byToda Tadayoshi 3rd (Toda) Daimyō of Tawara 1647–1664 Succeeded byMiyake Yasukatsu Preceded byYamazaki Ieharu 1st (Toda) Daimyō of Amakusa 1664–1671 Succeeded bynone Preceded byItakura Shigetane 1st (Toda) Daimyō of Iwatsuki 1682–1686 Succeeded byMatsudaira Tadachika Preceded byŌkubo Tadatomo 1st (Toda) Daimyō of Sakura 1686–1699 Succeeded byToda Tadazane Preceded byNagai Naotsune 7th Kyoto Shoshidai 1678–1681 Succeeded byInaba Masamichi