Ephialtes (disambiguation)

Ephialtes was a fifth century BC Athenian statesman

Ephialtes may also refer to:

• Ephialtes, in Greek mythology, one of the twin Aloadae, possibly the same as the Giant (below)
• Ephialtes, in Greek mythology, one of the Giants, possibly the same as the Aloadae (above)
• Ephialtes (illness), name given in the 18th century to an anxiety disorder
• Ephialtes of Trachis, soldier who betrayed the Spartan army at Thermopylae to the Persians