The Joint Architectural Review Board is a nationally recognized awards program between the Towns of Leesburg, Purcellville, and Middleburg, Loudoun County, and the Loudoun Preservation Society to recognize outstanding projects in the locally designated historic districts across the County. The program began in 2008 and has recognized over 150 examples of architectural excellence and successful preservation projects in the four participating jurisdictions.

In 2011, a community-wide category was added, known as the Community Blue Ribbon award, which allows individuals to nominate projects of great importance to them, regardless of location. These projects can be anywhere in Loudoun County, including incorporated Towns, and need not be located within designated historic districts. The Blue Ribbon category can also be applied to unique preservation projects beyond the architectural.

This year's Joint Architectural Review Board awards will be held on September 25, 2025.