Nanjai Station (南蛇井駅, Nanjai-eki) is a passenger railway station in the city of Tomioka, Gunma, Japan, operated by the private railway operator Jōshin Dentetsu.

Nanjai Station is a station on the Jōshin Line and is 28.2 kilometers from the terminus of the line at Takasaki.

The station consists of a single island platform connected to the station building by a level crossing.

Nanjai Station opened on 2 July 1897.

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