Nairi (Akkadian: 𒆳𒆳𒈾𒄿𒊑, romanized: mātāt [KUR.KUR] Na-i-ri, lit. 'Nairi lands', also Na-'i-ru; Armenian: Նաիրի) was the Akkadian name for a region inhabited by a particular group (possibly a confederation or league) of tribal principalities in the Armenian Highlands, approximately spanning the area between modern Diyarbakır and Lake Van and the region west of Lake Urmia. Nairi has sometimes been equated with Nihriya, known from Mesopotamian, Hittite, and Urartian sources. However, its co-occurrence with Nihriya within a single text may argue against this.
Prior to the Bronze Age collapse, the Nairi tribes were considered a force strong enough to contend with both Assyria and Hatti. If Nairi and Nihriya are to be identified, then the region was the site of the Battle of Nihriya (c. 1230 BCE), the culminating point of the hostilities between Hittites and Assyrians for control over the remnants of the former kingdom of Mitanni.