The 5th Royal Inniskilling Dragoon Guards was a cavalry regiment of the British Army formed in 1922 by the amalgamation of the 5th Dragoon Guards and the 6th (Inniskilling) Dragoons. It served in the Second World War and the Korean War. In August 1992, as a consequence of the Options for Change defence cuts, the regiment was amalgamated with the 4th/7th Royal Dragoon Guards to form the Royal Dragoon Guards.

There are 13 cavalry Regiments of the British Army each with its own unique cap badge, regimental traditions, and history. Of the currently nine regular cavalry regiments, two serve as armoured regiments, three as armoured cavalry regiments, three as light cavalry, and one as a mounted ceremonial regiment. There are also four yeomanry regiments of the Army Reserve, of these, three serve as light cavalry and one as an armoured regiment. Each yeomanry light cavalry unit has been paired with a regular unit of the same role, the armoured yeomanry unit is paired with the two regular armoured units. All except the Household Cavalry are part of the British Army's Royal Armoured Corps.