1. In Greek mythology, King Eurytus, or Eurýtos of Oschalia (Oikhalia), Thessaly, was the father of Dryope and Iole. Autolycus stole his cattle. Eurytus promised his daughter, Iole, to whoever could beat his sons in an archery contest. Heracles won but Eurytus abandoned his promise. Heracles killed him and his sons, and abducted Iole.

Alternative: Erytus

2. Eurytus or Eurýtos was the name of a Spartan warrior, one of the Three Hundred sent to face the Persians at the Battle of Thermopylae in 480 BCE. Eurytus and a companion, Aristodemus were stricken with eye infections and ordered to return home. Eurytus turned back and ordered his helot attendant to lead him back to the battle. He entered the battle blind and was slain. Aristodemus returned to Sparta disgraced.