In Greek mythology, Erecteus (in ancient Greek Ερεχθεύς, transl. Erechtheús) was a king of the city-state of Athens.
There are two versions for the myth. In one, he is identified with Erictonius, son of Gaia and Hephaestus.
In the other version, he is the son of King Pandion I of Athens. To win in the fight against the Eleusinians and the Thracians, he sacrificed, according to his wife, one of his three daughters (Euripides, in his play Ion, gives him a fourth daughter, Creusis), which gave reason for Poseidon to later annihilate him and his offspring. He was succeeded by his brother Cicrope II.