Dorieus (died c.510 BC; Greek: Δωριεύς) was a Spartan prince of the Agiad dynasty who is mentioned several times in Herodotus. The second son of Anaxandridas II, he was the younger half-brother of Cleomenes I and the elder full brother of both Leonidas I and Cleombrotus. He tried to found a colony in Cinyps (Libya) but failed. He tried again to establish a colony in western Sicily, but was killed by the Carthaginians.