The Willys MB SAS Jeep, also known as the "Desert Jeep," was a specially modified version of the Willys MB used by the British Special Air Service (SAS) during World War II. Originating from the standard American-built Willys MB, these jeeps were adapted for the harsh conditions of the North African desert where the SAS conducted their operations.

Introduced in 1942, the SAS Jeeps were heavily modified to enhance their combat effectiveness. They were stripped of non-essential parts to reduce weight and fitted with additional fuel cans, water containers, and weapons mounts, including twin Vickers K machine guns for increased firepower. The jeeps were painted in desert camouflage and equipped with sand tires to improve mobility over rough desert terrain.

The SAS used these jeeps for deep-penetration raids behind enemy lines, targeting airfields, supply depots, and communication lines. Their agility, firepower, and ability to traverse difficult terrain made them ideal for these covert operations. The success of the Willys MB SAS Jeep in these missions cemented its legacy as a symbol of innovation and adaptability in military vehicle history.