- Died: 1572
- Sons: Ogasawara Ujikiyo, Ogasawara Yoshiyori, Ogasawara Kiyohiro, Ogasawara Tsunauji
- Titles: Sakyo daiyu
- Childhood name:
- Other names: Okihachiro, Nagauji
- Distinction: Imagawa retainer
Nagauji was the son of Ogasawara Nagataka. He served the Imagawa and was given Takatenjin castle after he defeated Fukushima Masanari and thereby established the Takatenjin branch of the Ogasawara. He married a daughter of Imagawa Ujichika.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005