was the 7th daimyà  of Odawara Domain in Sagami Province, (modern-day Kanagawa Prefecture) in mid-Edo period Japan. His courtesy title was Kaga no Kami.
Tadazane was born in Edo in 1782 (some sources state 1778) as the son of the 6th daimyà  of Odawara, à Âkubo Tadaaki. He succeeded to headship of the à Âkubo clan and Odawara Domain upon his father's death in 1796.
During his tenure, he reformed the domain's faltering finances, particularly through his employment of the scholar Ninomiya Sontoku, who reformed the domain's taxes and encouraged development of agriculture through immigration from other domains. In 1800, Tadazane had his start in the Tokugawa administration as a Sà Âshaban, or Master of Ceremonies. Four years later, on 28 January 1804, he was appointed to the concurrent position of Jisha-bugyà  (Magistrate of Temples and Shrines). On 25 June 1810, he became Osaka Castellan, followed by the post of Kyoto Shoshidai from 16 April 1815. As was usually the case with holders of the latter office, Tadazane became a Rà Âjà « under the shà Âgun Tokugawa Ienari upon the completion of his duties in 1818 (having been recommended by Matsudaira Sadanobu). He died 19 years later, while still holding the office of Rà Âjà «, in 1837. His grave is at the clan temple of Saisho-ji in Setagaya, Tokyo.
Tadazane was married to a daughter of Hachisuka Haruaki, daimyà  of Tokushima Domain, but his only son and heir à Âkubu Tadanaga died in 1831. He adopted Tadanaga's son, Tadanao as his heir.
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