| Duchnów | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Otwock |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Wiązowna |
| Coordinates: | 52.1833°N 42°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population As Of: | 2021 |
| Population Total: | 788 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 05-462 |
| Area Code Type: | Telephone code |
| Area Code: | 22 |
| Code1 Name: | SIMC |
| Code1 Info: | 0009917 |
| Registration Plate Type: | Vehicle registration |
| Registration Plate: | WOT |
Duchnów is a village in the administrative district of Gmina Wiązowna, within Otwock County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 3km (02miles) north-east of Wiązowna, 100NaN0 north-east of Otwock, and 250NaN0 east of Warsaw.