The Royal Tank Regiment (RTR) is an armoured regiment of the British Army. It was formerly known as the Tank Corps and the Royal Tank Corps. It is part of the Royal Armoured Corps and is made up of two operational regiments, the 1st Royal Tank Regiment (1RTR) and the 2nd Royal Tank Regiment (2RTR).

The Royal Tank Regiment's formation followed the invention of the tank. Tanks were first used at Flers in September 1916 during the Battle of the Somme in World War I. At that time the six tank companies were grouped as the Heavy Branch of the Machine Gun Corps (MGC).

On 28 July 1917 the Heavy Branch was by Royal Warrant separated from the rest of the MGC and given official status as the Tank Corps.

After World War II, the RTR was reduced through various amalgamations, first in 1959-60:

·         3RTR and 6RTR amalgamated as 3RTR

·         4RTR and 7RTR amalgamated as 4RTR

·         5RTR and 8RTR amalgamated as 5RTR