| Nishi-Ōsaki Station | |
| Style: | JR East |
| Native Name: | 西大崎駅 |
| Native Name Lang: | ja |
| Address: | Iwadeyama-Shimonome aze Koizumi 119, Ōsaki-shi, Miyagi-ken 989-6412 |
| Country: | Japan |
| Coordinates: | 38.6301°N 140.8894°W |
| Operator: | JR East |
| Line: | Rikuu East Line |
| Platforms: | 1 side platform |
| Tracks: | 1 |
| Distance: | 21.9 km from |
| Structure: | At grade |
| Status: | Unstaffed |
| Opened: | 1 November 1917 |
| Former: | Kami-Iwadeyama (until 1997) |
| Map Type: | Japan |
is a railway station on the Rikuu East Line in the city of Ōsaki, Miyagi Prefecture, Japan, operated by East Japan Railway Company (JR East).
Nishi-Ōsaki Station is served by the Rikuu East Line, and is located 21.9 rail kilometers from the terminus of the line at Kogota Station.
Nishi-Ōsaki Station has one side platform, serving a single bi-directional track. There is no station building. The station is unattended.
Nishi-Ōsaki Station opened on 20 April 1960 as . The station was absorbed into the JR East network upon the privatization of JNR on 1 April 1987. The station was renamed to its present name on 22 March 1997.