Admiral Sir Henry Bradwardine Jackson (1855–1929) was the First Sea Lord of the Admiralty from 1915 to 1916 during the First World War. Photo from The War Illustrated, 26 June 1915. Caption reads: :Admiral Sir Henry Bradwardine Jackson K.C.B., K.C.V.O., F.R.S., A.I.N.A., M.I.E.E.