The son of an Indian Army officer, Colonel Charles Noble and Anne née Hay, he was educated at Edinburgh Academy, before being commissioned in the Royal Navy on 15 January 1894. Promoted as Lieutenant on 1 April 1902, Noble was posted to the battleship HMS Hannibal serving in the Channel Fleet. He served in the Grand Fleet during the First World War. From 1918 to 1925 he commanded the cruisers HMS Calliope and HMS Calcutta and then the battleship HMS Barham before being appointed Senior Naval Officer, Harwich in 1925. He then commanded HMS St Vincent based at Forton, Gosport from 1927. He was appointed Director of Operations Division at the Admiralty in 1928. He was then Director of Naval Equipment from 1931 before returning to sea in command of the 2nd Cruiser Squadron in 1932. He then returned to the Admiralty as Fourth Sea Lord in 1935, before returning as Commander-in-Chief, China Station in 1938. in 1942. On his return to London, Admiral Noble was appointed Commander-in-Chief, Western Approaches, headquartered at Derby House, Liverpool, from February 1941 to November 1942. His work in reorganising escort groups, and revamping escort training methods are widely regarded as having been crucial foundational elements of the eventual success of the Allied navies in the Atlantic theatre. Noble was remembered by those who worked with him at Derby House as an easy-going commander, and an agreeable person to work with. Always conciliatory, Noble was an expert at building consensus around his chosen courses of action. Noble was, although not forced, certainly pushed out of Western Approaches to make room for Admiral Sir Max Horton, whose combative personality and experience in the submarine service made him the ideal candidate in the eyes of some to take the war to the U-boats. He succeeded Admiral Sir Andrew Cunningham as Head of the British Naval Delegation to Washington DC in 1942, before retiring from active naval service in 1945. By way of recognition, Noble was granted the title of Rear-Admiral of the United Kingdom on 19 June 1945.
Family
Noble married, in 1907, Diamantina Isabella, only daughter of Allan Campbell. She died in 1909, having one son. He married secondly, in 1913, Celia Emily, daughter of Robert Kirkman Hodgson DL and Lady Norah née Boyle, having another son, Charles Noble. A memorial to Admiral Sir Percy Noble was placed in the north choir aisle of Liverpool Cathedral in 1957.