Sansai Station (三才駅, Sansai-eki) is a railway station on the Shinano Railway Kita-Shinano Line in the city of Nagano, Japan, operated by the third-sector railway operating company Shinano Railway[1] Sansai Station is served by the 37.3 km Kita-Shinano Line, and is 6.8 kilometers from the starting point of the line at Nagano Station.

The station consists of two opposed side platforms serving two tracks.

[1] The platforms are connected by both a level crossing and an underground passage.

[2] From 14 March 2015, with the opening of the Hokuriku Shinkansen extension from Nagano to Kanazawa, local passenger operations over sections of the Shinetsu Main Line and Hokuriku Main Line running roughly parallel to the new Shinkansen line were reassigned to third-sector railway operating companies.

[3] From this date, Sansai Station was transferred to the ownership of the third-sector operating company Shinano Railway.