HMS Unruffled was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness, and operated from April 1942 until being scrapped in January 1946. So far she has been the only ship of the Royal Navy to bear the name Unruffled.
Okrety ! podwodne w sluzbie Wielkiej Brytanii - wydane dla Admiralicji 1946 (115801131)
British Submarine 'unruffled' Home With Honours. 15 February 1943, Malta, HMS Unruffled, Just Returned From the Mediterranean Where She Supported the Allied Victories in North Africa, Sicily and Italy A14688
British Submarine 'unruffled' Home With Honours. 15 February 1943, Malta, HMS Unruffled, Just Returned From the Mediterranean Where She Supported the Allied Victories in North Africa, Sicily and Italy A14685
The Royal Navy during the Second World War A14687
British Submarine 'unruffled' Home With Honours. 15 February 1943, Malta, HMS Unruffled, Just Returned From the Mediterranean Where She Supported the Allied Victories in North Africa, Sicily and Italy A14686