The gens Messia was a plebeian family at Rome. The first person of this name to appear in history is Vettius Messius, a Volscian soldier whose courage inspired his comrades in a desperate battle against the Romans in 431 BC. It is not known when the Messii first obtained Roman citizenship. Members of the family appear in the lists of annual magistrates during the final decades of the Republic. In imperial times, some of the Messii achieved the highest offices of the Roman state.