The Tokyu 8090 series and the related Tokyu 8590 series were commuter electric multiple unit (EMU) train types that were operated by the private railway operator Tokyu Corporation in the Kanto region of Japan from 1980 until 2019.

The Tōyoko Line is a major railway line connecting Tokyo (Shibuya) and Yokohama. The line is owned and operated by the private railway operator Tokyu Corporation. The name of the line, Tōyoko (東横), is a combination of the first characters of Tōkyō (東京) and Yokohama (横浜), and is the mainline of the Tokyu network. The section between Den-en-chofu and Hiyoshi Station is a quadruple track corridor with the Tōkyū Meguro Line.