The Tazawako Line (田沢湖線, Tazawako-sen) is a railway line operated by East Japan Railway Company (JR East) connecting Morioka Station in Morioka, Iwate and Ōmagari Station in Daisen, Akita, Japan.

In 1964, the Shizukuishi to Akabuchi section opened, and upon completion of the 3,915 m (2.433 mi) Sengan Tunnel, the Akabuchi to Tazawako section opened on 20 October 1966, completing the line.

[1] Freight services ceased in 1982, the year the entire line was electrified.

[citation needed] In 1997, the line was converted to 1,435 mm (4 ft 8+1⁄2 in) gauge, and became part of the Akita Shinkansen, with standard-gauge electric multiple unit (EMU) trains providing local services on the line.

As of 2022, 701-5000 series trains belonging to Akita General Rolling Stock Center are used on this line.