Kuroishi is a city located in Aomori Prefecture, Japan. As of 31 January 2023, the city had an estimated population of 31,540 in 13948 households and a population density of 150 persons per km2. The total area of the city is 217.05 square kilometers (83.80 sq mi).

The Tsugaru clan was a Japanese samurai clan who ruled the northwestern half of what is now Aomori Prefecture in the Tōhoku region of Japan under the Edo period Tokugawa shogunate. The Tsugaru were daimyō of Hirosaki Domain and its semi-subsidiary, Kuroishi Domain. The Tsugaru were in constant conflict with their former overlords, the Nanbu clan of adjoining Morioka Domain. During the Boshin War of 1868-69, the Tsugaru clan fought mostly on the pro-imperial side, although it did briefly join the Ōuetsu Reppan Dōmei. In the Meiji period, the former daimyō became part of the kazoku peerage, with Tsugaru Tsuguakira receiving the title of hakushaku (Count). The main Tsugaru line is now extinct.