Unison Historic District is a national historic district located at Unison, near Middleburg, Loudoun County, Virginia. It encompasses 41 contributing buildings and 3 contributing structures in the village of Unison. It is primarily residential, but also includes a church, former school, store, and saddle-maker's shop. The oldest buildings are "Butterland" and "Elton." Other notable buildings include the Thornton Walker House, Mary Phillips House, Henry Evans House, Glatton Folly (c. 1820), and Unison United Methodist Church.[3]