Ust-Abakan (Russian: Усть-Абакан, romanized: Ust'-Abakan; Khakas: Ағбан пилтiрi, Ağban piltërë) is an urban-type settlement and the administrative center of Ust-Abakansky District of the Republic of Khakassia, Russia. Population: 14,578 (2010 Russian census); 14,913 (2002 Census); 15,831 (1989 Soviet census).