Glycon (or Glykon) is a Roman serpent-deity, who was worshipped in the village of Abonutticus, under the rule of the Roman emperor Antoninus Pius.
The only mention of its existence is made by the Greek satirist Lucian, who devoted to the deity a treatise, Alexander or the False Prophet, against the Greek prophet Alexander of Abonutticus, who had inaugurated the cult of this deity and whom Lucian accuses of fraud.