The Tōyoko Line (東横線 ,Tō-Yoko Sen?) is a major commuter railway line connecting Tokyo (Shibuya) to Yokohama of the private Tokyu Corporation. The name

The first section of the line from Tamagawa to Kanagawa (separate from the present Kanagawa of Keikyū) opened on February 14, 1926. The line was extended incrementally until the entire length from Shibuya to Sakuragichō in Yokohama was opened on March 31, 1932. On August 29, 1964, through service to the Tokyo Metro Hibiya subway line started.

On January 30, 2004, the section of Yokohama to Sakuragichō was abandoned, and two days later on February 1, replaced with a line slightly more closer to the sea side, Minatomirai Line.