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 (Princess Charlotte of Wales's) 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.