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.

1	■ Jōshin Line	for Shimonita
2	■ Jōshin Line	for Takasaki

Nanjai Station opened on 2 July 1897.

• Nanjai Post Office

• List of railway stations in Japan

Media related to Nanjai Station at Wikimedia Commons

• Jōshin Dentetsu (in Japanese)
• Burari-Gunma (in Japanese)