The Uchiko Line (内子線, Uchiko-sen) is the name of a short section of railway line that was originally a branch line before a section of it was upgraded and became part of the Yosan Line. It connects Uchiko in Uchiko, Kita District to Niiya in Ōzu, entirely in Ehime Prefecture on the island of Shikoku, Japan, and operated by the Shikoku Railway Company (JR Shikoku). The line is operationally part of the Yosan Line, and retains it separate name due to the Japanese naming convention which requires a formal change of name, which has not occurred in this case.
