- Other Names: 貞幹 (Sadayoshi)
- Japanese: 小笠原 忠幹 (Ogasawara Tadayoshi)
Ogasawara Tadayoshi was a Bakumatsu era lord of Anji domain. Following the death of lord of Kokura domain Ogasawara Tadahiro in 1860, Tadayoshi became lord of Kokura; his son Ogasawara Sadazane succeeded him as lord of Anji domain.
- Ishin Shiryô Kôyô 維新史料綱要, vol 3, 365.