Kaminoyama is a city located in Yamagata Prefecture, Japan. As of 31 October 2020, the city had an estimated population of 29,617 in 11278 households, and a population density of 120 persons per km2. The total area of the city is 240.93 square kilometres (93 sq mi).

Kaminoyama Domain a feudal domain in Edo period Japan, located in Dewa Province, Japan. It was centered on Kaminoyama Castle in what is now the city of Kaminoyama, Yamagata.