| Olszewka | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Przasnysz |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Jednorożec |
| Pushpin Map: | Poland |
| Coordinates: | 53.2167°N 24°W |
Olszewka is a village in the administrative district of Gmina Jednorożec, within Przasnysz County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 10km (10miles) north of Jednorożec, 250NaN0 north-east of Przasnysz, and 1110NaN0 north of Warsaw.