Gentius was an Illyrian king who belonged to the Labeatan dynasty. He ruled in 181–168 BC, being the last attested Illyrian king. He was the son of Pleuratus III, a king who kept positive relations with Rome. The capital city of the Illyrian kingdom under Gentius was Scodra.

The Illyrians were a group of Indo-European-speaking people who inhabited the western Balkan Peninsula in ancient times. They constituted one of the three main Paleo-Balkan populations, along with the Thracians and Greeks.