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Alliance of Ōuetsu Domains 奥羽越列藩同盟 (Japanese) Ōuetsu reppan dōmei
1868–1868
Flag
Headquarters	Shiroishi, Sendai Domain, Mutsu Province
Membership	31 domains (han) Mutsu Sendai Morioka Fukushima Hirosaki Nihonmatsu Moriyama Ichinoseki Hachinohe Yunagaya Tanagura Nakamura Miharu Iwakitaira Izumi Shimotedo Dewa Yonezawa Yamagata Kaminoyama Tendō Kubota Shinjō Honjō Kameda Yashima Echigo Nagaoka Shibata Murakami Muramatsu Mineyama Kurokawa Ezo Matsumae
Leaders
• Alliance leader (nominal head)	Prince Rinnōji
• Governor-general (de facto head)	Date Yoshikuni Uesugi Narinori
Historical era	Bakumatsu (Boshin War)
• Battle of Toba–Fushimi	27 January 1868
• Established	25 June 1868
• Battle of Aizu	6 October 1868
• Battle of Noheji	7 November 1868
• Disestablished	November 1868
Today part of	Japan (prefectures) Aomori Iwate Miyagi Fukushima Akita Yamagata Niigata Hokkaido

The О̄uetsu Reppan Dо̄mei (奥羽越列藩同盟, Alliance of О̄uetsu domains), also known in English as the Northern Alliance, was a coalition formed by Japanese feudal domains during the Boshin War in 1868. The term Ōuetsu is derived from the abbreviations for the three provinces in which almost all of the member domains were located: Mutsu (Ō), Dewa (U), and Echigo (Etsu). The alliance was both military and political in nature, and was primarily established to combat the newly restored imperial government.