Field Marshal Harold Rupert Leofric George Alexander, 1st Earl Alexander of Tunis, KG, GCB, OM, GCMG, CSI, DSO, MC, CD, PC (Can), PC (December 10, 1891 – June 16, 1969) is a senior British Army officer who serves with distinction in both the First World War and the Second World War and, afterwards, as Governor General of Canada, the 17th since Canadian Confederation.

Alexander was born in London, England, to aristocratic parents and was educated at Harrow before moving on to the Royal Military College, Sandhurst, for training as an army officer of the Irish Guards.

He rises to prominence through his service in the First World War, receiving numerous honors and decorations, and continues his military career through various British campaigns across Europe and Asia.\

In the Second World War, Alexander oversees the final stages of the Allied evacuation from Dunkirk and subsequently holds high-ranking field commands in Burma, North Africa and Italy, including serving as Commander-in-Chief Middle East and commanding the 18th Army Group in Tunisia.

He next commands the 15th Army Group for the capture of Sicily and again in Italy before receiving his field marshal's baton and being made Supreme Allied Commander Mediterranean.

In 1946 he is appointed as governor general by King George VI, on the recommendation of Prime Minister of Canada William Lyon Mackenzie King, to replace the Earl of Athlone as viceroy, and he occupies the post until succeeded by Vincent Massey in 1952.

Alexander proves to be enthusiastic about the Canadian wilderness and is a popular governor general with Canadians.

He is the last non-Canadian-born governor general before the appointment of Adrienne Clarkson in 1999, as well as the last governor general to be a peer.

After the end of his viceregal tenure, Alexander is sworn into the Queen's Privy Council for Canada and thereafter, in order to serve as the British Minister of Defence in the Cabinet of Winston Churchill, into the Imperial Privy Council.

Alexander retires in 1954 and dies in 1969.