Nakayama Tadachika

was a Japanese court noble and writer during the late Heian and early Kamakura period and a member of the influential Fujiwara family. His works are valuable historical documents describing a pivotal period in Japanese history when power shifted from aristocratic families at the Heian court to regional military rulers such as daimyōs and shōguns.

Family He was the third son of , member of the Kasannoin family who were direct descendants of the Hokke branch of the Fujiwara clan. His mother was a daughter of . Living the last years of his life in Nakayama, in the Eastern part of the capital at Heian-kyō (Kyoto), he took the name .

Political career He made a career as lieutenant general of the imperial guards, became Head Chamberlain (kurōdo no tō) and in 1164 was appointed as associate counselor (Sangi) at the Imperial court. He held the position of bettō of the retired Emperor Go-Shirakawa. In 1185 Minamoto no Yoritomo recommended him as one of ten to discuss politics in council. It is also sometimes referred to as "Tadachika Anthology".