Bel Air
- County:
- Harford County
- County Seat:
- No
- Area (mi²):
- 3.031
- State:
- Maryland
Bel Air is a town located in Harford County, Maryland. Bel Air has a 2026 population of 10,395. Bel Air is currently declining at a rate of -0.99% annually and its population has decreased by -2.83% since the most recent census, which recorded a population of 10,698 in 2020.