Colonel Sir Dermot McMorrough Kavanagh GCVO (1890–1958) was Crown Equerry of the Royal Household of the Sovereign of the United Kingdom from 1941 to 1955. He was educated at Eton College, and served in the 11th Hussars from 1909. MacMorrough Kavanagh was Assistant Military Secretary in Eastern Command from 1926 to 1930, and, on promotion to Lieutenant-Colonel, Commanding Officer of the 11th Hussars from 1932 to 1936. In 1939 he was promoted to Colonel, and served in France in 1940.