The gens Ostoria, occasionally written Hostoria, was a plebeian family at Rome. Members of this gens are first mentioned in the early years of the Empire. Although only a few of them achieved any prominence in the Roman state, many others are known from inscriptions. The most illustrious of the Ostorii was probably Publius Ostorius Scapula, who was consul during the reign of Claudius, and afterward governor of Britain.