| Olszewka | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Ostrołęka |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Lelis |
| Pushpin Map: | Poland |
| Coordinates: | 53.1333°N 48°W |
Olszewka is a village in the administrative district of Gmina Lelis, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 9km (06miles) south-west of Lelis, 110NaN0 north-west of Ostrołęka, and 1070NaN0 north of Warsaw.