Svietlahorsk (Belarusian: Светлаго́рск, [sʲvʲetɫaˈɣorsk], until 1961 Šacilki, Belarusian: Шацілкі) is a town in the Svietlahorski Rajon of Gomel Region of Belarus, the administrative center of the rajon (district). It is located by the river Biarezina and has 69,900 inhabitants (2010 estimate).