Dalrymple-Hamilton was the second son of Col Hon. North de Coigny Dalrymple-Hamilton,
MVO, of Bargany, Girvan, Ayrshire, and the grandson of the
10th Earl of Stair.
Sir North Dalrymple-Hamilton was his elder brother. He joined the
Royal Navy in 1905 and served in
World War I. and while in command he took part in the sinking of the German battleship
Bismarck. He was appointed
Admiral Commanding, Iceland in 1941 and
Naval Secretary in 1942. He went on to be
Vice-Admiral Malta and Flag Officer, Central Mediterranean in April 1945. After the War he was appointed
Flag Officer, Scotland and Northern Ireland and then, from 1948, Admiral at the British Joint Services Mission in
Washington D. C. ==Family==