William L. "Wild Bill" Carlisle (May 4, 1890 – June 19, 1964) was one of the last train robbers of the American West known as the "Robin Hood of the Rails" and "The White-Masked Bandit".

He was caught on 22 April 1916 and was sentenced to life imprisonment in the Wyoming State Penitentiary in Rawlins on 10 May 1916 after a two-day trial, even though he never shot anyone during the robberies and did not take money from women, children or servicemen.

[6] However, Carlisle decided he could not wait that long to be released, and on 15 November 1919 he escaped from Wyoming State Penitentiary by being carried outside the walls in a packing crate with a shipment of shirts.

He again robbed a train on November 18 but found most of the passengers were soldiers and sailors returning from service in France during World War I; Carlisle did not take money from these.

[5] Carlisle was paroled on 8 January 1936 for good behavior and on 23 December 1936 he married Lillian Lavina Berquest (died 1962), the superintendent of the local nursing home who took care of him after an operation for a ruptured appendix.