Simeonovgrad (Bulgarian: Симеоновград [simɛˈɔnovˌɡrat]) is a town in the Haskovo Province of southern Bulgaria, located on both banks of the Maritsa River.

Near Simeonovgrad lie the ruins of the Ancient Roman and Byzantine fortress of Constantia (Greek: Κωνσταντία) from the Late Antiquity (4th century AD), which developed into one of the large towns of Northern Thrace until the beginning of the 13th century.

For most of the Socialist period, between 1946–1981, the town was named Maritza (Bulgarian: Марица), after the river.

The present name Simeonovgrad literally means "town of Simeon", a reference to the 10th-century Bulgarian king.

This Haskovo Province, Bulgaria location article is a stub.