| Sianno | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Sochaczew |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Brochów |
| Coordinates: | 52.3183°N 20.3103°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 81 |
Sianno is a village in the administrative district of Gmina Brochów, within Sochaczew County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 4km (02miles) east of Brochów, 120NaN0 north-east of Sochaczew, and 490NaN0 west of Warsaw.