Parrhasius (Ancient Greek: Παρράσιος) was, in Greek mythology, the name of two individuals:
- Parrhasius or Parrhasus, an Arcadian prince as one of the 50 sons of the impious King Lycaon either by the naiad Cyllene,[1] Nonacris[2] or by unknown woman. In some accounts, his father was Zeus. Parrhasius was also called the father of Arcas who had the region named after him. He was a hero and founder of the Arcadian city of Parrhasia.[3]
- Parrhasius, twin brother of Lycastus and son of Ares and Phylonome, daughter of Nyctimus and Arcadia. Their mother them into the river Erymanthus but they survived when a wolf suckled them and a shepherd, Gyliphus, reared them. Parrhasius succeeded later to the throne of Arcadia.[4]