Sermylia (), or Sermyle (ãõÃÂüÃÂû÷), was a town of Chalcidice, between Galepsus and Mecyberna. The town gave its name to the Toronaic Gulf, which was also called Sermylicus Sinus (úÃÂûÃÂÿàãõÃÂüàûùúÃÂà- kolpos Sermylikos). Pseudo Scylax writes that it was a Greek city. It was a member of the Delian League.
The site of Sermylia is near the modern Ormylia.