The Itō Line is a railway line owned by the East Japan Railway Company which connects Atami and Itō Stations, along the east coast of Izu Peninsula in Shizuoka Prefecture, Japan. From Itō, the line continues south to Shimoda under the privately owned and operated Izu Kyūkō Line.

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.