Ogasawara Sadanaga

Ogasawara Sadanaga was a warrior of the Ogasawara clan of Shinano Province in the late Kamakura and Northern and Southern Courts period, a son of Ogasawara Munenaga. The Kansei Choshu Shokafu calls him the younger brother of Sadamune.

Older genealogies instead name him either the eldest son or an adopted heir of his grandfather Nagauji. He lived in Shinano, and his son Takanaga carried on the family.