Nabû-à ¡uma-ukîn II, inscribed <sup>m</sup>[<sup>d</sup>]Nabû-à ¡uma-úkîn or <sup>m</sup>à  uma-[úkîn], whose complete name (meaning "Nabû has established legitimate progeny") is only known from the Kinglist A, was a usurper and briefly king of Babylon for one month and two days during 732 BC before he was swept aside by his successor, Nabû-mukin-zÃÂri.
His reign was so fleeting he was omitted from the Ptolemaic Canon. His Assyrian contemporary was Tukultë-apil-Eà ¡arra III who was too distracted campaigning in Syria to react to political events. He came to power as a disaffected former provincial governor leading a rebellion against Nabû-nÃÂdin-zÃÂri, the son and successor of Nabû-Nasir.
He was deposed and replaced by the Chaldean chief, Nabû-mukin-zÃÂri, of the Bët-Amukani tribe, within weeks establishing a trend as later pretenders from the traditional Babylonian population were likewise to be displaced quickly by Chaldeans, Marduk-zakir-à ¡umi II by Marduk-apla-iddina II in 703 BC and Nergal-uà ¡ezib by Muà ¡ezib-Marduk in 692 BC.