Demetrius of Pharos (also Pharus) is a ruler of Pharos involved in the First Illyrian War, after which he rulei a portion of the Illyrian Adriatic coast on behalf of the Romans, as a client king.

Demetrius is a regent ruler to Pinnes, the son of Agron who is too young too rule as king.

While the Romans are occupied with their own problems, he has grown stronger as an ally of Macedonia and also by conquering Dimallum of Dalmatia, on the shore facing Issa.

Together with Scerdilaidas, he sails south of Lissus and breaks the Roman treaty, attacking Roman allies in the Adriatic and devastating and plundering many cities in the Cyclades and the Peloponnese.

He is expelled from Illyria by Rome after the Second Illyrian War and becomes a trusted councilor at the court of Philip V of Macedon.

He becomes a strong political influence to Philip V and encourages him to clash with Rome.

Demetrius remains there until his death at Messene in 214 BCE while attempting to take the city.