Matsudaira Yasutō (松平 康任) was a Japanese senior councillor of the late Edo period. The seventh lord of the Hamada Domain, he was also the governor of Suō. He served in a variety of positions in the Tokugawa shogunate, including magistrate of temples and shrines, Osaka Castle warden and Kyoto Shoshidai. In 1826, he was made a rōjū; from 1834 to 35, he was chief rōjū (rōjū shusseki). He resigned as senior councillor after being held responsible for the Sengoku incident, which brought him in conflict with Mizuno Tadakuni and his faction in the shogunate. In 1836, he was placed under permanent house arrest after he was implicated for smuggling in the Takeshima incident, and died the following year.