Thoricus or Thorikos (Ancient Greek: Θορικός) was a city, and later a deme in the southern portion of ancient Attica, one of the twelve original settlements that were united in the synoikismos attributed to Theseus to form Archaic Athens. It was later a deme of the phyle of Acamantis. Near it are the mines of Laurion, where lead and silver was mined from Neolithic times, and worked in the industrial quarter of the settlement. There is a theatre dating from c. 525–480 BC. The modern site is Lavrio.