Ōkubo Tadanori (大久保 忠礼, January 13, 1842 – August 10, 1897) was the 9th daimyō of Odawara Domain in Sagami Province, (modern-day Kanagawa Prefecture) in late-Edo period Japan.

He was born as the 5th son of Matsudaira Yorihiro, daimyō of Takamatsu Domain, in Sanuki Province.

During the Boshin War of the Meiji Restoration, he permitted the pro-Imperial forces of the Satchō Alliance to cross Hakone Pass without opposition.

In July 1875, when Tadayoshi retired from public life, Tadanori returned to the leadership of the Ōkubo clan.

He died on August 10, 1897, and his grave is at the clan temple of Saisho-ji in Setagaya, Tokyo.