The 13th/18th Royal Hussars (Queen Mary's Own) was a cavalry regiment of the British Army. It was formed by the amalgamation of the 13th Hussars and the 18th Royal Hussars in 1922 and, after service in the Second World War, it amalgamated with the 15th/19th The King's Royal Hussars to form the Light Dragoons in 1992.

The regiment was created, as part of the reduction in cavalry in the aftermath of the First World War, by the amalgamation of the 13th Hussars and the 18th Royal Hussars on 9 November 1922. It was re-named as the 13th/18th Royal Hussars (Queen Mary's Own) after Queen Mary, who was Colonel-in-Chief of the regiment, in December 1935. The regiment transferred to the Royal Armoured Corps in April 1939. During the Second World War, the regiment served as a reconnaissance unit with the 1st Armoured Reconnaissance Brigade, part of 1st Infantry Division, during the Battle of France. It then served with the 27th Armoured Brigadeuntil January 1944 when it transferred to the 8th Armoured Brigade and, having been equipped with Sherman DD tanks, it took part in the Battle of Normandy in June 1944.