The Ōito Line is a railway line in Japan which connects Matsumoto Station in Nagano Prefecture with Itoigawa Station in Niigata Prefecture. There are two operators on the line: East Japan Railway Company and West Japan Railway Company. Minami-Otari is the boundary for the two companies. The section of the line operated by JR East, between Minami-Otari and Matsumoto, is electrified and trains are fairly regular along this section. The JR West section from Minami-Otari to Itoigawa, however, is not electrified and sees less use. Trains operate less frequently along this section.

Matsumoto Station is a train station in the city of Matsumoto, Nagano Prefecture, Japan, operated by East Japan Railway Company, and the private railway operator Alpico Kōtsū.