| Grudziewszczyzna | |
| Settlement Type: | Village |
| Total Type: | |
| Coordinates: | 54.1169°N 23.3503°W |
| Pushpin Map: | Poland |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Podlaskie |
| Subdivision Type2: | County |
| Subdivision Name2: | Sejny |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Sejny |
| Population Total: | 30 |
| Population Footnotes: | (approx.) |
Grudziewszczyzna (;) is a village in the administrative district of Gmina Sejny, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Lithuania.[1]