In this Japanese name, the family name is Matsudaira.

Matsudaira Sadanobu (松平 定信, January 15, 1759 – June 14, 1829) Japanese daimyo and shogunate administrator of the mid-Edo period. He is famous for his financial reforms which saved the Shirakawa Domain. He also made similar reforms during his time as chief senior councilor (rōju shuza; 老中首座) of the Tokugawa Shogunate, from 1787 to 1793.