The Yamada Line is a regional railway line in Japan operated by East Japan Railway Company. The railway line connects Morioka Station in Morioka City to Miyako Station in Miyako City, and is named after the town of Yamada in Iwate Prefecture, which the line used to serve. The railway line traverses through the Kitakami Mountains, running parallel to National Route 106 for most of its length.

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.