Westbury
- County:
- Nassau County
- County Seat:
- No
- Area (mi²):
- 2.344
- State:
- New York
Westbury is a village located in Nassau County, New York. Westbury has a 2026 population of 15,871. Westbury is currently growing at a rate of 0.53% annually and its population has increased by 0.39% since the most recent census, which recorded a population of 15,810 in 2020.