Ostra was an ancient Roman town near the modern town of Ostra Vetere. The Roman town was inhabited from the 3rd century BC until the 6th century AD.

History

Pliny the Elder mentions Ostra with another ancient town, Suasa, 5 mi west. Neither town survived beyond the classical period. Though Ostra is little mentioned by ancient authors, excavations there have brought to light remains of various buildings and several inscriptions.