Biryusinsk () is a town in Tayshetsky District of Irkutsk Oblast, Russia, located on the right bank of the Biryusa River (Angara's basin),  northwest of Irkutsk, the administrative center of the oblast.
Biryusinsk () is a municipality in Tayshetsky District of Irkutsk Oblast, Russia, positioned adjacent to the Biryusa River (Angara's watershed area), northwesternly situated relative to Irkutsk, the regional capital.