The gens Caelia was a plebeian family at ancient Rome. The nomen Caelius is frequently confounded with Coelius and Caecilius, with some individuals referred to as Caelius in manuscripts, while appearing as Coelius or Coilius on coins. Although the Caelii asserted their great antiquity, none of them attained any of the higher offices of the Roman state until the praetorship of Publius Caelius in 74 BC, and the first of this gens who obtained the consulship was Gaius Caelius Rufus in AD 17. The emperor Balbinus was a descendant of the Caelii.