| Osiek | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Płońsk |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Joniec |
| Pushpin Map: | Poland |
| Coordinates: | 52.5942°N 20.5428°W |
Osiek is a village in the administrative district of Gmina Joniec, within Płońsk County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 3km (02miles) west of Joniec, 120NaN0 east of Płońsk, and 530NaN0 north-west of Warsaw.
This gentry village ("wieś szlachecka", i.e., owned by a noble) became part of the in the second half of the XVI. Between 1975 and 1998, this place belonged to the Ciechanów Voivodeship.