Amitadhvaja is an ancient demon-king. In the Vali-Vāsava(Vasava) Saṃvāda (Samvada; Discourse) in Śāntiparva (Santiparva) of Mahābhārata (Mahabharata), Vali mentioned several demon-kings who had victory over Svargaloka. Amitadhvaja was one of them.