Sannohe is a town located in Aomori Prefecture, Japan. As of 31 January 2023, the town had an estimated population of 9,146 in 4141 households, and a population density of 60 persons per km2. The total area of the town is 151.79 square kilometres (58.61 sq mi).

The Nanbu clan was a Japanese samurai clan who ruled most of northeastern Honshū in the Tōhoku region of Japan for over 700 years, from the Kamakura period through the Meiji Restoration of 1868. The Nanbu claimed descent from the Seiwa Genji of Kai Province and were thus related to the Takeda clan. The clan moved its seat from Kai to Mutsu Province in the early Muromachi period, and were confirmed as daimyō of Morioka Domain under the Edo-period Tokugawa shogunate. The domain was in constant conflict with neighboring Hirosaki Domain, whose ruling Tsugaru clan were once Nanbu retainers.