Oniniwa Tsunamoto (鬼庭 綱元) (1549 – July 13, 1640) was a Japanese samurai of the late Sengoku period through early Edo period. He was the son of Oniniwa Yoshinao. His half-sister, Katakura Kita was also Katakura Kagetsuna's half sister. Together with Katakura Kagetsuna and Date Shigezane, Tsunamoto was known as one of the "Three Great Men of the Date Clan". Tsunamoto served the Date clan, and by the end of his life was the only Date retainer who was both older than and outlived Date Masamune.