Nakayama Tadachika (中山 忠親, 1131 – April 23, 1195) 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 His works are valuable historical documents describing a pivotal period in Japanese history when power shifted from aristocratic families at the Heian court to regional military rulers such as daimyōs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.