Vassilios or Vassileios, also transliterated Vasilios, Vassilis or Vasilis (Greek: Βασίλειος or Βασίλης), is a Greek given name, the origin of Basil. In ancient/medieval/Byzantine context, it is also transliterated as Basileios. It is directly descended from the word "Kingdom", Greek: Βασιλεία. It may refer to: