Floyd Allen (July 5, 1856 – March 28, 1913) was an American landowner and patriarch of the Allen clan of Carroll County, Virginia. He was convicted and executed for murder in 1913 after a sensational courthouse shootout the previous year that left a judge, prosecutor, sheriff, and two others dead, although the validity of the conviction has been a source of debate within Carroll County for decades. Allen, who was before the bar for sentencing after being convicted of taking a prisoner from a deputy sheriff, allegedly triggered the shooting at the Carroll County Courthouse in Hillsville on March 14, 1912.