Union County Courthouse or Old Union County Courthouse may refer to:
Union County Courthouse (Arkansas), El Dorado, Arkansas Union County Courthouse (Florida), Lake Butler, Florida Old Union County Courthouse (Georgia), Blairsville, Georgia Union County Courthouse (Illinois), Jonesboro, Illinois Union County Courthouse (Indiana), Liberty, Indiana Union County Courthouse (Iowa), Creston, Iowa Union County Courthouse (Kentucky), Morganfield, Kentucky Union County Courthouse (Mississippi), listed on the National Register of Historic Places Union County Courthouse (New Jersey), Elizabeth, New Jersey Union County Courthouse (New Mexico), Clayton, New Mexico Union County Courthouse (North Carolina), Monroe, North Carolina Old Union County Courthouse (Pennsylvania), New Berlin, Pennsylvania