Major General Robert Keith Arbuthnott, 15th Viscount of Arbuthnott CB, CBE, DSO, MC, DL (21 August 1897 – 15 December 1966) was a senior officer in the British Army.
He was educated at Fettes College and the Royal Military College, Sandhurst. He served in both World Wars and was mentioned in despatches. His major wartime appointments include Palestine 1938–1939 (despatches), GSO(2) Staff College 1938, commander of the 11th Infantry Brigade in Italy 1943–1944 and the 78th Infantry Division 1944–1946. After the war, he served as Chief of the British Military Mission to the Egyptian Army in 1946, Chief of Staff of the Scottish Command in 1948–1949, Commander of the Highland District and 51st (Highland) Infantry Division (Territorial Army) 1949–52, and retired in 1952 as a Major General.