| Kostowiec | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Pruszków |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Nadarzyn |
| Pushpin Map: | Poland |
| Coordinates: | 52.0667°N 65°W |
Kostowiec is a village in the administrative district of Gmina Nadarzyn, within Pruszków County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 5km (03miles) south-west of Nadarzyn, 120NaN0 south of Pruszków, and 240NaN0 south-west of Warsaw.