Washington County History & Landmarks Foundation is a non-profit educational institution in Washington, Pennsylvania, United States. Its purpose is to encourage and assist the preservation of historic structures in Washington County, Pennsylvania. The foundation operates its own landmark certification process, as well as working with the National Park Service to document and place landmarks on the National Register of Historic Places. It also offers advice and assistance for historic building owners who wish to preserve their facilities. Since its inception, the foundation has been successful in helping many historic building owners in the preservation of their structures.