Ōnuma Station (大沼駅, Ōnuma-eki) is a railway station on the Hakodate Main Line located in Nanae, Hokkaidō, Japan.

[2] The station has two platforms serving three tracks on the ground level.

The station was opened on 28 June 1903 by the private Hokkaido Railway as an intermediate station during the phase of expansion when the track was extended north from Hongō (today Shin-Hakodate-Hokuto) to Mori.

On 12 October 1909 the station became part of the Hakodate Main Line.

On 1 April 1987, with the privatization of Japanese National Railways (JNR), the successor of JGR, control of the station passed to JR Hokkaido.