is a junction passenger railway station located in the city of Kokubunji, Tokyo, Japan, operated by East Japan Railway Company (JR East).
Nishi-Kokubunji Station is served by the Chà «à  Line (Rapid) from to , and by the orbital Musashino Line from to and Tokyo. It is 32.8 kilometers from the terminus of the Chà «à  Line at Tokyo Station and 3.9 kilometers from the starting point of the Musashino Line at Fuchà «hommachi.
The station consists of two side platforms serving two tracks at ground level for the Chà «à  Line (Rapid), and two elevated side platforms at right angles to these serving two tracks for the Musashino Line. A third track lies between these two tracks for use by non-stop freight trains.
The station has a "Midori no Madoguchi" staffed ticket office.
The station opened on 1 April 1973. With the privatization of Japanese National Railways (JNR) on 1 April 1987, the station came under the control of JR East.
In fiscal 2019, the station was used by an average of 29,577 passengers daily (boarding passengers only). The passenger figures for previous years are as shown below.