Saitō Uhyōe-Taihitsu Tatsuoki was a daimyo in Mino Province during the Sengoku period and the third generation lord of the Saitō clan. He was a son of Saitō Yoshitatsu, and a grandson of Saitō Dōsan. He was also a nephew of Oda Nobunaga's first wife, Nohime, herself a daughter of Saitō Dōsan.Saitō Tatsuoki succeeded his father at the age of 19. He was, however, an incapable ruler; unlike his father and grandfather.