松平定信
was the 6th Naitō "daimyō" of Murakami Domain under the Edo period Tokugawa shogunate of Japan. Nobuatsu was the eldest son of Naitō Nobuyori. the previous "daimyō". He was born in Edo, and became "daimyō" in 1781 on the death of his father. In the year 1800 he was appointed a "sōshaban" and rose to the post of "Jisha-bugyō" in 1813. in 1817, he was appointed a "wakadoshiyori" followed by "Kyoto Shoshidai" in 1823. He died while in office in Kyoto in 1825. His wife was a daughter of Yanagisawa Yasumitsu of Yamato-Kōriyama Domain. He later remarried to a daughter of Matsudaira Sadanobu of Shirakawa Domain.