The Tsurumi Line is a group of 3 railway lines operated by East Japan Railway Company in Kanagawa Prefecture, Japan. Originally built to service the port and adjacent industrial area, the lines provide passenger services along a line between Tsurumi Station in Tsurumi-ku, Yokohama and Ōgimachi Station in Kawasaki-ku, Kawasaki, and 2 short branches with a total length of track to 9.7 km (6.0 mi). The gauge is 1,067 mm, two sections of the line have double track and the line is electrified at 1,500 V DC.

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.