Ogasawara Sadayasu

• Died: 1856/8/9
• Other Names: 益之助 (Masunosuke)
• Japanese: 小笠原 貞寧 (Ogasawara Sadayasu)

Ogasawara Sadayasu was a Bakumatsu period lord of Chizuka han, a branch domain of Kokura han, from 1854 to 1856.

He succeeded his brother Ogasawara Tadahiro as lord of Chizuka in 1854 when Tadahiro became heir to the lord of Kokura domain.

Sadayasu then retired two years later, on 1856/6/6 in favor of his adopted heir, Ogasawara Sadamasa. Sadayasu died two months later, on 1856/8/9.

Preceded by Ogasawara Tadahiro

Lord of Chizuka han 1854-1856

Succeeded by Ogasawara Sadamasa