Saitō Uhyōe-Taihitsu Tatsuoki (斎藤 右兵衛・大筆 龍興 Saitō Uhyōe-Taihitsu Tatsuoki?, 1548–August 14, 1573) 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.
Tatsuoki became involved in a bitter rivalry with Akechi Mitsuhide, and lost to him decisively in 1564. He survived, but from this point on the Saitō clan were no longer a significant faction in the power struggles of the Sengoku period.  After Oda Nobunaga conquered the Saito in 1567, he was exiled, though he is known to have fought in armies against Nobunaga numerous times, until his death in 1573.
This article incorporates text from OpenHistory.
- Saito Dosan - SamuraiWiki. The Samurai Archives. Accessed December 23, 2009.
- Gyuichi, Ota (1610). The Chronicle of Lord Nobunaga. Leiden: Brill. p. 113.
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