Honjō Domain was a feudal domain in Edo period Japan, located in Dewa Province, Japan. It was centered on Honjō Castle in what is now the city of Yurihonjō, Akita.

The Ōuetsu Reppan Dōmei was a Japanese military-political coalition established and disestablished over the course of several months in early to mid-1868 during the Boshin War. Its flag was either a white interwoven five-pointed star on a black field, or a black interwoven five-pointed star on a white field. It is also known as the Northern Alliance .