The Rikuu East Line is a railway line in Japan, operated by the East Japan Railway Company. It connects Kogota Station in Misato, Miyagi Prefecture to Shinjō Station in Shinjō, Yamagata Prefecture, acting as a connector between the Tōhoku Main Line, Ōu Main Line, and Tōhoku Shinkansen in the southern Tōhoku region, and provides access to north-western Miyagi Prefecture and north-eastern Yamagata Prefecture.

The East Japan Railway Company is a major passenger railway company in Japan, the largest of the seven Japan Railways Group companies. The company name is officially abbreviated as JR-EAST or JR East in English, and as JR Higashi-Nihon in Japanese. The company's headquarters are in Yoyogi, Shibuya, Tokyo, next to Shinjuku Station. It is listed in the Tokyo Stock Exchange, is a constituent of the TOPIX Large70 index, and is one of three Japan Railways Group constituents of the Nikkei 225 index, the others being JR Central and JR West.