Tadachika OKUBO was a busho (Japanese military commander) and fudai daimyo (a daimyo in hereditary vassal to the Tokugawa family) in the Sengoku period (period of warring states) to the early Edo period.
大久保忠隣（おおくぼただちか）は、戦国時代(日本)から江戸時代前期にかけての武将・譜代大名。