| Białusny Lasek | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Ostrołęka |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Myszyniec |
| Coordinates: | 53.3667°N 40°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 347 |
Białusny Lasek is a village in the administrative district of Gmina Myszyniec, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 3km (02miles) south-west of Myszyniec, 380NaN0 north-west of Ostrołęka, and 1300NaN0 north of Warsaw.