Angarsk (Russian: Ангарск, IPA: [ɐnˈgarsk]) is a city and the administrative center of Angarsky District of Irkutsk Oblast, Russia, located on the Kitoy River, 51 kilometers (32 mi) from Irkutsk, the administrative center of the oblast. Population: 233,567 (2010 Census); 247,118 (2002 Census); 265,835 (1989 Census).

Angarsk has the largest industrial zone in Asia. It includes Angarsk Petrochemical Complex and Angarsk Electrolysis Chemical Complex. Angarsk also hosts a showcase international nuclear fuel cycle center, which will be one of the first Russian enrichment centers to be placed under IAEA safeguards. Angarsk is also the site for a Nuclear Fuel Bank, following a decision by the IAEA in November 2009; working with Russia, IAEA established this bank to supply market priced fuel to member states as protection against possible supply disruptions.