Teos (Ancient Greek: Τέως) or Teo was an ancient Greek city on the coast of Ionia, on a peninsula between Chytrium and Myonnesus. It was founded by Minyans from Orchomenus, Ionians and Boeotians, but the date of its foundation is unknown. Teos was one of the twelve cities which formed the Ionian League. The city was situated on a low hilly isthmus.