Ust-Ordynsky () is a rural locality (a settlement) and the administrative center of Ekhirit-Bulagatsky District of Ust-Orda Buryat Okrug in Irkutsk Oblast, Russia, as well as the administrative center of Ust-Orda Buryat Okrug. It is located on the right bank of the Kuda River (Angara River's tributary) northeast of Irkutsk.