Epirus Nova ("New Epirus") or Illyria Graeca or Illyris proper is a province of the Roman Empire established by Diocletian during his restructuring of provincial boundaries.

The province had belonged to the province of Macedonia; it later becomes a theme of the Byzantine Empire.

Dyrrhachium (or Epidamnus) is established as the capital of Epirus Nova.

The region of Epirus Nova corresponds to a portion of Illyria that is at this time "partly Hellenic and partly Hellenized".The area is the line of division between the provinces of Illyricum and Macedonia and suffers from terrible earthquakes.