The Kidarites, or Kidara Huns, were a dynasty that ruled Bactria and adjoining parts of Central Asia and South Asia in the 4th and 5th centuries. The Kidarites belonged to a complex of peoples known collectively in India as the Huna, and in Europe as the Chionites, and may even be considered as identical to the Chionites. The 5th century Byzantine historian Priscus called them Kidarite Huns, or "Huns who are Kidarites". The Huna/Xionite tribes are often linked, albeit controversially, to the Huns who invaded Eastern Europe during a similar period. They are entirely different from the Hephthalites, who replaced them about a century later.

The Hephthalites, sometimes called the White Huns, were a people who lived in Central Asia during the 5th to 8th centuries CE, part of the larger group of the Iranian Huns. They formed an empire, the Imperial Hephthalites, and were militarily important from 450 CE, when they defeated the Kidarites, to 560 CE, when combined forces from the First Turkic Khaganate and the Sasanian Empire defeated them. After 560 CE, they established "principalities" in the area of Tokharistan, under the suzerainty of the Western Turks and of the Sasanian Empire, before the Tokhara Yabghus took over in 625.