The Ōito Line (大糸線, Ōito-sen) 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 (JR East) operates the section north of Minami-Otari Station in Otari, Nagano Prefecture, and West Japan Railway Company (JR West) operates the remaining section. 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 is used very little, compared to the electrified JR East section. Trains run far less regularly along this part.