Sarnau may refer to:

Anneke Kim Sarnau (born 1972), German actress Sarnau, a constituent community of Lahntal, Marburg-Biedenkopf, Germany Warburg–Sarnau railway Sarnau, a village in Carmarthenshire, Wales Sarnau railway station in Carmarthenshire, Wales Sarnau, a village in Ceredigion, Wales