| Sienno | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Kuyavian-Pomeranian |
| Subdivision Type2: | County |
| Subdivision Name2: | Bydgoszcz |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Dobrcz |
| Pushpin Map: | Poland |
| Coordinates: | 53.3°N 28°W |
Sienno is a village in the administrative district of Gmina Dobrcz, within Bydgoszcz County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.[1] It lies approximately 4km (02miles) north of Dobrcz and 240NaN0 north-east of Bydgoszcz.