Ōkubo Tadachika , or also known as Ōkubo Nagayasu , was daimyō of Odawara Domain in Sagami Province in early Edo period, Japan. Ōkubo Tadachika was the son of Ōkubo Tadayo, a Fudai daimyō hereditary vassal to the Tokugawa clan in what is now part of the city of Okazaki, Aichi.