| Piączyn | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Płock |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Staroźreby |
| Coordinates: | 52.6044°N 20.1086°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 120 |
Piączyn is a village in the administrative district of Gmina Staroźreby, within Płock County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 10km (10miles) east of Staroźreby, 290NaN0 east of Płock, and 750NaN0 north-west of Warsaw.