Sarnau railway station served the village of Bancyfelin, Carmarthenshire, Wales; it was close to the hamlet of Sarnau. It was on the West Wales Line.
The station opened on 2 January 1854. It was on the section of the South Wales Railway which opened that day between the temporary station near Carmarthen and , and was situated between Carmarthen and .
The station closed on 15 June 1964.