Gaius Julius Iullus may refer to:
- Gaius Julius Iullus (consul 489 BC), the first ancient patrician to attain the consulship
- Gaius Julius Iullus (decemvir), consul 482 BC, decemvir 451 BC
- Gaius Julius Iullus (consul 447 BC), also consul 435 BC
- Gaius Julius Iullus (censor), consular tribune 408 and 405 BC, censor 393 BC
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