Vopiscus Julius C. f. L. n. Iulus was a Roman statesman, who held the consulship in 473 BC, a year in which the authority of the Roman magistrates was threatened after the murder of a Tribune of the Plebs.
Vopiscus was the son of Gaius and grandson of Lucius. His father is usually supposed to be the same Gaius Julius Iulus who had been consul in BC 489. He was the brother of Gaius Julius Iulus, the consul of 482. He had at least two sons: Lucius, who was magister equitum to the dictator Aulus Postumius Tubertus in 431, and held the consulship in the following year; and Spurius, who seems not to have held any magistracies, but who was the father of Gaius Julius Iulus, consular tribune in 408 and 405, and Lucius Julius Iulus, consular tribune in 403. Sextus Julius Iulus, who was consular tribune in 424, may have been a younger son of Vopiscus, or perhaps the son of his nephew, Gaius, who was consul in BC 447.
The year before Vopiscus' election, the consuls Lucius Furius Medullinus Fusus and Gnaeus Manlius Vulso, had blocked all attempts at agrarian reform, and no sooner had they left office than they were summoned to account for their conduct by the tribune Gnaeus Genucius. He had previously brought to trial Titus Menenius Lanatus, whose failure to intervene in the Battle of the Cremera during his consulship in BC 477 had led to the utter destruction of the Fabii and the loss of an important strategic position, and Spurius Servilius Priscus Structus, who as consul in 476 recklessly attacked a Veientine force that had taken the Janiculum, and only been rescued from disaster by the arrival of his colleague. Menenius had escaped with a fine and his life, but soon sickened and died; while Servilius was acquitted due to the boldness of his defense, and the support of his colleague, Aulus Verginius Tricostus Rutilus.