is a junction railway station in the city of Kaminoyama, Yamagata, Japan, operated by the East Japan Railway Company (JR East).
Kaminoyama-Onsen Station is served by the à Âu Main Line (Yamagata Line) and the Yamagata Shinkansen. It is 75.0 rail kilometers from the terminus of both lines at Fukushima Station.
The station has a single side platform and a single island platform connected to the station building by a footbridge. The station has a Midori no Madoguchi staffed ticket office.
The station opened on 15 February 1901 as . It was absorbed into the JR East network upon the privatization of JNR on 1 April 1987. Kaminoyama Station was renamed Kaminoyama-Onsen Station on 1 July 1992, coinciding with the opening of the Yamagata Shinkansen. A new station building was completed in June 2004.
In fiscal 2018, the station was used by an average of 1521 passengers daily (boarding passengers only).