The Biwako Line is the nickname used by the operator of the West Japan Railway Company to refer to the portion of the Tōkaidō Main Line and the Hokuriku Main Line. The section, along with JR Kyoto Line and JR Kobe Line, forms a contiguous service that is the main trunk of JR West's "Urban Network" commuter rail network in the Osaka-Kobe-Kyoto Metropolitan Area.

The West Japan Railway Company, also referred to as JR West , is one of the Japan Railways Group companies and operates in western Honshu. It has its headquarters in Kita-ku, Osaka. It is listed in the Tokyo Stock Exchange, is a constituent of the TOPIX Large70 index, and is also one of only three Japan Railways Group constituents of the Nikkei 225 index: the others are JR East and JR Central. It was also listed in the Nagoya and Fukuoka stock exchanges until late 2020.