Agin-Buryat Okrug
Agin-Buryat Autonomous Okrug 
    Агинский-Бурятский автономный о́круг  | |
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| Coordinates: 51°0′N 114°30′E / 51.000°N 114.500°E | |
| Country | Russia | 
| Federal subject | Zabaykalsky Krai | 
| Established | 2008 | 
| Administrative center | Aginskoye | 
51°00′N 114°30′E / 51.000°N 114.500°E
Agin-Buryat Okrug (Russian: Аги́нский Буря́тский о́круг; Buryat: Агын Буряадай тойрог, Agyn Buryaaday Toyrog), or Aga Buryatia, is an administrative division of Zabaykalsky Krai, Russia. It was a federal subject of Russia (an autonomous okrug of Chita Oblast) until it merged with Chita Oblast to form Zabaykalsky Krai on March 1, 2008. Prior to the merger, it was called Agin-Buryat Autonomous Okrug (Аги́нский Буря́тский автоно́мный о́круг). Its administrative center is the urban-type settlement of Aginskoye. It is one of the two Buryat okrugs in Russia, the other one is Ust-Orda Buryat Okrug of Irkutsk Oblast.
- Area: 19,312.3 square kilometers (7,456.5 sq mi)
 - Population: 77,167 (2010 Census); 72,213 (2002 Census); 77,032 (1989 Soviet census).