Bardylis or Bardyllis (; ; c. 448 – 358 BC) was a king of the Dardanian Kingdom and probably its founder. Bardyllis created one of the most powerful Illyrian states, that of the Dardanians. His state reigned over Macedonia, Epirus and the lakeland (Lyncestia). Bardyllis lived over 90 years according to ancient sources, implying that he died around 358 BC. Although his name appears in sources from much later, in the events of 359 BC, it seems that he headed the Dardanian State long before the Illyrians. According to these sources, Bardyllis lived a long time and was at an advanced age when he faced Philip II of Macedon.