JR京都線
The line is named after , which the route runs along. Line nicknames were introduced when the newly privatized JR West intended to use "familiar" names over official line names, such as Tōkaidō Main Line and Fukuchiyama Line. Biwako Line did not appear on the first list, and instead The JR Kyoto Line was to be called up to Maibara. A move in Shiga Prefecture opposed the name, claiming that the name of Kyoto Line in Shiga sounds like an auxiliary, requiring its own name in the prefecture. Biwako Line was thus made to refer to the section between Maibara and Kyoto.