Lycastus or Lykastos, also known as Lycastum or Lykaston, was an ancient Greek city in ancient Pontus, on a river bearing the same name. It was situated 20 stadia southeast of Amisus. Pomponius Mela calls the town Lycasto. Pherecydes spoke of a town of Lycastia, inhabited by Amazons, and situated between Themiscyra and Chalybia. The river Lycastus was but a small stream, which after a short course emptied itself into the Euxine close by the town of Lycastus.