Czersk [t​͡ʂɛrsk] is a settlement in the administrative district of Gmina Góra Kalwaria, within Piaseczno County, Masovian Voivodeship, in east-central Poland. It lies approximately 2 kilometres (1 mi) south-east of Góra Kalwaria, 19 km (12 mi) south-east of Piaseczno, and 33 km (21 mi) south-east of Warsaw.

The settlement has an approximate population of 590.