| Ostrów | |
| 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: | Rościszewo |
| Coordinates: | 52.9022°N 19.8233°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 70 |
Ostrów is a village in the administrative district of Gmina Rościszewo, within Sierpc County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 11km (07miles) east of Sierpc and 1110NaN0 north-west of Warsaw.