Major Arthur Algernon Dorrien-Smith DSO DL JP (28 January 1876 – 30 May 1955)[1] was Lord Proprietor of the Isles of Scilly from 1918 to 1920.

[5] Following the end of hostilities in June 1902, he left Cape Town for England and returned to Southampton in early August.

On the death of his father in 1918, he succeeded as Lord Proprietor of the Isles of Scilly, a position he held until 1920 when the lease for the majority of the Isles of Scilly was handed back to the Duchy of Cornwall, Dorrien-Smith retaining control only over Tresco.

He continued the work of his father and developed Tresco Abbey Gardens making many trips to South Africa looking for suitable trees and plants.

In 1909 he again visited Australia, New Zealand and the Chatham Islands, and had a total collection of plants and seeds of about 2280 specimens.