Westmoreland County may refer to:
Australia
- Westmoreland County, New South Wales
- the former name of Westmoreland Land District, Tasmania
Canada
- Westmorland County, New Brunswick
United Kingdom
- The county of Westmorland, archaically spelt Westmoreland
United States
- Westmoreland County, Pennsylvania
- Westmoreland County, Virginia
- Westmoreland County, Connecticut - A former county in Connecticut located in present-day Wyoming Valley
See also
- Westmoreland Parish, Jamaica