Oflag VI-B was a World War II German prisoner-of-war camp for officers (Offizerlager), located 1 km (0.62 mi) south-west of the village of Dössel (now part of Warburg) in north-western Germany.
The camp was opened in September 1940 on what had been originally intended to be a military airfield. At first French, and then British officers were housed there.
The camp was the setting for two remarkable escape attempts. On 1 December 1941 Flt Lt Peter Stevens RAFVR, disguised as a German Unteroffizier, led a party of 10 POWs disguised as orderlies, and two more disguised as guards complete with dummy rifles, up to the gates of the camp. The sentry was not satisfied with their gate pass, so Stevens marched his party back into the camp. As the sentry was apparently unaware that the party was not genuine, a second attempt was made a week later. This time the sentry demanded to see their Army paybooks, so the escape party fled, although two were arrested.
On 30 August 1942 the camp was the scene of "Operation Olympia", also known as the "Warburg Wire Job", another mass escape attempt. After ROAC officer Major B.D. Skelton ("Skelly") Ginn fused the perimeter floodlights, 41 prisoners carrying four 12-foot (3.7 m) scaling ladders made from bed slats rushed to the barbed-wire fence and clambered over. One ladder collapsed, so of the 41 involved, only 28 escaped the camp, and only three of those made it home.
6B or 6b or VI-B may refer to :