Tokugawa Mochinaga (徳川 茂徳, June 11, 1831 – March 6, 1884) was a Japanese samurai who was an influential figure of the Bakumatsu period.
His childhood name was Chinzaburo (鎮三郎).
The son of Matsudaira Yoshitatsu of Takasu han, his brothers included the famous Matsudaira Katamori, Matsudaira Sadaaki, and Tokugawa Yoshikatsu.
First serving as daimyō of his native Takasu Domain, and then the Owari Domain, Mochiharu retired before succeeding to the headship of the Hitotsubashi branch of the Tokugawa house.
An important figure in the Bakumatsu period, he eventually retired the Hitotsubashi headship in favor of his son Satomichi.