Chemtou or Chimtou was an ancient Roman-Berber town in northwestern Tunisia, located 20 km from the city of Jendouba near the Algerian frontier. It was known as Simitthu (or Simitthus in Roman period) in antiquity.
Chemtou was founded in the 4th to 5th century BC as a colony of the Berber kingdom of Numidia. It later became a Roman town in the province of Africa. The city was important enough to become a bishopric, before its eventual abandonment around the 9th to 10th century.