| Kierszek | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Piaseczno |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Konstancin-Jeziorna |
| Coordinates: | 52.1061°N 21.0553°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Elevation M: | 102 |
Kierszek is a village in the administrative district of Gmina Konstancin-Jeziorna, within Piaseczno County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 5km (03miles) north-west of Konstancin-Jeziorna, 60NaN0 north-east of Piaseczno, and 130NaN0 south of Warsaw.