(Λαβύνητος), a name common to several of the Babylonian monarchs. It seems to have been a title rather than a proper name. A Labynetus is mentioned by Herodotus (1.74) as mediating, in conjunction with a prince of Cilicia, a peace between Cyaxares and Alyattes. From the chronology, it is clear that this Labynetus must have been identical with Nebuchadnezzar.

Another Labynetus is mentioned by Herodotus (1.77) as a contemporary of Cyrus and Croesus, with the latter of whom he was in alliance. This Labynetus is the same with the Belshazzar of the prophet Daniel. By other writers he is called Nabonadius or Nabonidus. He was the last king of Babylon. [CYRUS.] The mode in which the city was captured by Cyrus is described by Herodotus, 1.188.