| Gromadzyn | |
| 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: | Sochocin |
| Pushpin Map: | Poland |
| Coordinates: | 52.6667°N 49°W |
Gromadzyn is a village in the administrative district of Gmina Sochocin, within Płońsk County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 3km (02miles) south-east of Sochocin, 80NaN0 north-east of Płońsk, and 620NaN0 north-west of Warsaw.