Ephialtes was a fifth century BC Athenian statesman.

Look up Ephialtes in Wiktionary, the free dictionary.

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 Aload (above)
• Ephialtes (illness), name given in the 18th century to an anxiety disorder
• Ephialtes of Trachis, betrayed the Greek army at Thermopylae to the Persians
• Ephialtes (wasp), a genus of wasps in the family Ichneumonidae

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