General Sir Miles Christopher Dempsey, GBE, KCB, DSO, MC (15 December 1896 – 5 June 1969) was a senior British Army officer who served in both World Wars. During the Second World War he had a close relationship with Bernard Montgomery and commanded XIII Corps for the invasions of Sicily and Italy. He later commanded the British Second Army during the Battle of Normandy and made notably rapid advances in the subsequent campaign in Northern France and Belgium. Dempsey was the first British Army commander to cross the Rhine. A career infantryman who made his reputation in active service, he remains relatively unknown.
Dempsey was born in Cheshire in 1896 and was educated at Shrewsbury School where he captained the first eleven Cricket team in 1914. On leaving Shrewsbury he attended the Royal Military College, Sandhurst during the First World War.
He is the descendant of a powerful clan in Offaly and Laois in Ireland with a very long history. His ancestor Terence O'Dempsey, Viscount Clanmalier, was loyal to the Catholic King James II and, as a result, lost all his lands in 1691. Dempsey's branch of the family then left Ireland for Cheshire.