The Keihan Ishiyama Sakamoto Line (京阪石山坂本線, Keihan Ishiyama Sakamoto-sen) is a railway line in Shiga Prefecture, Japan, operated by the private railway operator Keihan Electric Railway.

The Otsu Railway opened the Hamaotsu to Awazu section in 1913, electrified at 600 V DC.

[1] The line was extended to Ishiyamadera (as single track) the following year.

[citation needed] The Hamaotsu to Miidera section opened in 1922 (dual track electrified), and in 1927 the company merged with a tourist boat operator to become the Biwako Railway & Steamship Co., which extended the line to Sakamoto the same year.

[citation needed] The Awazu to Ishiyama section was double-tracked in 1943, but in 1945 the Sakamoto to Shigasato section was singled and the rails recycled for the Japanese war effort.