Ina-Ōshima Station (伊那大島駅, Ina-Ōshima-eki) is a railway station on the Iida Line in the town of Matsukawa, Shimoina District, Nagano Prefecture, Japan operated by Central Japan Railway Company (JR Central).

Ina-Ōshima Station is served by the Iida Line and is 143.1 kilometers from the starting point of the line at Toyohashi Station.

The station consists of two opposed ground-level side platforms connected by a level crossing.

Ina-Ōshima Station opened on 13 July 1922.

With the privatization of Japanese National Railways (JNR) on 1 April 1987, the station came under the control of JR Central.