The gens Claudia (Latin: [ˈkɫau̯di.a]), sometimes written Clodia, was one of the most prominent patrician houses at ancient Rome. The gens traced its origin to the earliest days of the Roman Republic. The first of the Claudii to obtain the consulship was Appius Claudius Sabinus Regillensis, in 495 BC, and from that time its members frequently held the highest offices of the state, both under the Republic and in imperial times.
Plebeian Claudii are found fairly early in Rome's history. Some may have been descended from members of the family who had passed over to the plebeians, while others were probably the descendants of freedmen of the gens. In the later Republic, one of its patrician members voluntarily converted to plebeian status and adopted the spelling "Clodius".