| Kosianka Leśna | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Podlaskie |
| Subdivision Type2: | County |
| Subdivision Name2: | Siemiatycze |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Grodzisk |
| Pushpin Map: | Poland |
| Coordinates: | 52.5833°N 65°W |
| Population Total: | 60 |
Kosianka Leśna is a village in the administrative district of Gmina Grodzisk, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland.[1] It lies approximately 2km (01miles) west of Grodzisk, 200NaN0 north-west of Siemiatycze, and 670NaN0 south-west of the regional capital Białystok.