Atratinus is a Roman cognomen that may refer to:
Aulus Sempronius Atratinus (consul 497 BC), prefect of Rome during the Battle of Lake Regillus Lucius Sempronius Atratinus (consul 444 BC) Aulus Sempronius Atratinus (consular tribune 444 BC) Aulus Sempronius Atratinus (consular tribune 425 BC), one of the first censors of the Roman Republic Gaius Sempronius Atratinus, consul of the Roman Republic in 423 BC Aulus Sempronius Atratinus, magister equitum in 380 BC Lucius Sempronius Atratinus (consul 34 BC) Marcus Asinius Atratinus, consul of the Roman Empire in 89 AD