Aginskoye is an urban locality and the administrative center of Agin-Buryat Okrug and of Aginsky District in Zabaykalsky Krai, Russia. It is located in the valley of the Aga River. Population: 15,596 (2010 census); 11,717 (2002 census); 9,286 (1989 Soviet census); 7,200 (1967).