The Neoarchaikum is a geological age. It is within the geological eon of the Archean, the last of four ages ( Neoarchaikum = " new Archean " ) dar. It starts before 2,800 million years ago with the end of Mesoarchaikums and ends in front of about 2,500 million years ago with the beginning of Paläoproterozoikums.

Recent research suggests that in Neoarchaikum the conditions for the emergence of higher mountains were given for the first time. In the ages before the continental lithosphere was not strong enough due to their high temperature and at low thickness for topographic elevations greater than 2,500 meters.

See also: Geologic time scale