Ust-Buzulukskaya () is a rural locality (a stanitsa) and the administrative center of Ust-Buzulukskoye Rural Settlement, Alexeyevsky District, Volgograd Oblast, Russia. The population was 2,364 as of 2010. There are 32 streets.
Ust-Buzulukskaya is located on the right bank of the Khopyor River, 20 km south of Alexeyevskaya (the district's administrative centre) by road. Lunyakinsky is the nearest rural locality.