- Born: 1839
- Died: 1860
- Other Names: 貞嘉 (Sadahiro), 直之助 (Naonosuke)
- Japanese: 小笠原 忠嘉 (Ogasawara Tadahiro)
Originally known as Sadahiro, he succeeded his older brother Ogasawara Sadayoshi as lord of Chizuka upon Sadayoshi's death in 1851. In 1854, Sadahiro was then adopted by Ogasawara Tadaakira, lord of Kokura, and replaced as lord of Chizuka by a different brother, Ogasawara Sadayasu.
|Lord of Chizuka han
|Lord of Kokura han
- Ishin Shiryô Kôyô 維新史料綱要, vol 1 (1937), 310, 612.