| Osiek Piaseczny | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Sierpc |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Zawidz |
| Coordinates: | 52.8°N 75°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
Osiek Piaseczny is a village in the administrative district of Gmina Zawidz, within Sierpc County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 5km (03miles) east of Zawidz, 210NaN0 south-east of Sierpc, and 980NaN0 north-west of Warsaw.