Saigō Tanomo (西郷 頼母, May 16, 1830 – April 28, 1903) was a Japanese samurai of the late Edo period.

Chief senior councilor (hittōgarō 筆頭家老) of the Aizu clan, he achieved fame due to his distinguished action in the Boshin War.

[1] Succeeding to family headship and the position of chief senior councilor in 1860, he served the 9th generation Aizu daimyō, Matsudaira Katamori.

In 1868, with the rout at the Battle of Toba–Fushimi, and with Katamori back in Aizu for the first time in years, Tanomo's services were again called upon.

After spending a few years in prison, Tanomo was released in 1872, and subsequently opened up a private academy in the Izu region.