Admiral of the Fleet Sir Henry Conyers Leach, GCB, DL (18 November 1923 – 26 April 2011) was a Royal Navy officer who, as First Sea Lord and Chief of the Naval Staff during the early 1980s, was instrumental in convincing the British prime minister, Margaret Thatcher, that retaking the Falkland Islands from Argentina was feasible. On account of the determination he showed in the matter, journalist and political commentator Andrew Marr described him as Thatcher's "knight in shining gold braid".