The Bagratuni or Bagratid dynasty was an Armenian royal dynasty which ruled the medieval Kingdom of Armenia from c. 885 until 1045. Originating as vassals of the Kingdom of Armenia of antiquity, they rose to become the most prominent Armenian noble family during the period of Arab rule in Armenia, eventually establishing their own independent kingdom. Their domain included regions of Armenia such as Shirak, Bagrevand, Kogovit, Syunik, Lori, Vaspurakan, Vanand and Taron. Many historians, such as Cyril Toumanoff, Nicholas Adontz and Ronald Suny, consider them to be the progenitors of the Georgian royal Bagrationi dynasty.

Bagratid Armenia was an independent Armenian state established by Ashot I Bagratuni of the Bagratuni dynasty in the early 880s following nearly two centuries of foreign domination of Greater Armenia under Arab Umayyad and Abbasid rule. With each of the two contemporary powers in the region—the Abbasids and Byzantines—too preoccupied to concentrate their forces on subjugating the region, and with the dissipation of several of the Armenian nakharar noble families, Ashot succeeded in asserting himself as the leading figure of a movement to dislodge the Arabs from Armenia.