This is a list of regiments within the British Army's Royal Armoured Corps during World War II. On the creation of the corps in 1939, just before the outbreak of World War II, it comprised those regular cavalry and Territorial Army Yeomanry regiments that had been mechanised, together with the Royal Tank Regiment. As the war progressed and further horsed regiments were mechanised, they joined the corps, together with new (armoured) cavalry regiments that were raised for the hostilities. The RAC created its own training and support regiments, and in 1941 and 1942 a number of infantry battalions were converted to armoured regiments and joined the RAC. Lastly, the RAC subsumed the Reconnaissance Corps in 1944.