| Sierzno | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Pomeranian |
| Subdivision Type2: | County |
| Subdivision Name2: | Bytów |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Bytów |
| Coordinates: | 54.1178°N 17.4714°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 153 |
Sierzno is a village in the administrative district of Gmina Bytów, within Bytów County, Pomeranian Voivodeship, in northern Poland. It lies approximately 3km (02miles) south-west of Bytów and 810NaN0 west of the regional capital Gdańsk.