Prassilus or Prassilos (), or Prasstilus or Prasstilos (àÃÂìÃÂÃÂÃÂùûÿÃÂ), or Praxilus or Praxilos (àÃÂìþùûÿÃÂ), was a town of the Chalcidice in ancient Macedonia. It belonged to the Delian League since it appears in the tribute records of Athens of 421/0 BCE, where it paid a phoros of 900 drachmas. It is cited by Stephanus of Byzantium, who places it in Macedonia.
Its site is unlocated, but was probably located in the region of Bottiaea.