The Kotoden Shido line (琴電志度線, Kotoden Shido-sen) is a Japanese railway line in Kagawa Prefecture, which connects Kawaramachi Station in Takamatsu with Kotoden-Shido Station in Sanuki.

It is owned and operated by the Takamatsu-Kotohira Electric Railroad.

The line color is rose pink.

The line first opened on 18 November 1911 between Imabashi and Shido Station (now Kotoden-Shido), electrified at 600 V DC.

The line voltage was increased to 1,500 V DC from August 1966.