Gaius Asinius Nicomachus Julianus (ca 185 - aft. or ca 230) was the Proconsul of Asia between ca 225 and ca 230. He was the son of Gaius Asinius Quadratus Protimus, Proconsul in Achaea in 220.
He married Caesonia and was the father of Asinia Juliana Nicomacha (born ca 215), married before 240 Quintus Anicius Faustus (born ca 210), son of Quintus Anicius Faustus Paulinus, Legate of Moesia Inferior between 229 and 230, and they were the parents of Sextus Anicius Faustus Paulinus or Marcus Junius Caesonius Nicomachus Anicius Faustus Paulinus, Consul of Rome in 298.