Major Arthur Algernon Dorrien-Smith, DSO, DL, JP (28 January 1876 – 30 May 1955) was Lord Proprietor of the Isles of Scilly from 1918 - 1920.
Major Arthur Algernon Smith-Dorrien-Smith was born on 28 January 1876 at Oxfordshire. He was the son of Thomas Algernon Smith-Dorrien-Smith and Edith Anna Maria Tower. He married Eleanor Salvin Bowlby (d. 13 Apr 1978), daughter of Edward Salvin Bowlby and Elizabeth Vans Agnew, on 11 May 1909 at Holy Trinity Church, Sloane Street, London. There were four sons and three daughters from this marriage:
Dorrien-Smith was educated at Eton College.
He was commissioned a second lieutenant in the Rifle Brigade on 4 May 1898, and promoted to lieutenant on 3 February 1900. On the outbreak of the Second Boer War, his battalion was sent to South Africa, and he was mentioned in dispatches, and received the Distinguished Service Order (DSO) for his services during the war. He was promoted to captain on 22 January 1902. Following the end of hostilities in June 1902, he left Cape Town for England and returned to Southampton in early August. In 1904-5 he was an extra Aide-de-camp to Henry Northcote, 1st Baron Northcote, Governor-General of Australia, and retired in 1906, joining the Special Reserve. In the First World War he was Major, 6th Battalion (Reserve) Rifle Brigade, 1914; Brigade Major 17th Infantry Brigade, 1914–17; On the Staff 59th Division and 8th Corps, 1917-18.