Andrew Robert Buxton Cavendish, 11th Duke of Devonshire, KG, MC (January 2, 1920 - May 3, 2004) was a minister in the government of his uncle, British Prime Minister Harold Macmillan, from 1960-1964. He is best known for opening Chatsworth House to the public.

Cavendish was educated at Eton and Trinity College, Cambridge. In World War II, he was a major in the Coldstream Guards. He was awarded the Military Cross for his actions on July 27 1944 when his company was cut off for 36 hours in heavy combat near Strada in Italy.

In 1941 he married Deborah Mitford (born March 31, 1920), one of the famous Mitford sisters.

His older brother William, who would have inherited the dukedom, was killed in combat near the end of the war. William had married Kathleen Kennedy, John F. Kennedy's sister, only a few weeks before his death. With William's death Andrew became heir and received the courtesy title of Marquess of Hartington, which he held from 1944 until 1950

When the 10th Duke died of a heart attack in 1950, Andrew inherited the title. Along with the estate, however, came an inheritance tax bill of seven million pounds, nearly 80 percent of the value of the estate. In order to pay this, the Duke had to sell off many art objects and antiques, including several Rembrandts, Van Dycks and Raphaels, as well as thousands of acres of land, including Hardwick Hall.

He ran unsuccessfully as a Conservative candidate for Chesterfield in 1945 and 1950. He was Mayor of Buxton from 1952 to 1954. He served as Parliamentary Under-Secretary for Commonwealth Relations from 1960 to 1962, Minister of State at the Commonwealth Relations Office from 1962 to 1964, and for Colonial Affairs from 1963 to 1964. He once said that these appointments by his uncle, Harold Macmillan, the then-prime minister, were "the greatest act of nepotism ever".

The duke followed the family tradition of owning racehorses, the most famous of which was Park Top. Park Top was the subject of the duke's only published book A Romance of The Turf - Park Top which was published in 1976.

The duke's real estate holdings were vast. In addition to Chatsworth he also owned Lismore Castle in Ireland and Bolton Abbey in North Yorkshire.

In 1996 he was made a Knight of the Garter.

He once said to an interviewer:

Wonderful things have happened in my life - it's time my son had his turn. When I was young I used to like casinos, fast women and God knows what. Now my idea of Heaven, apart from being at Chatsworth, is to sit in the hall of Brooks's, having tea.

The Duke and Duchess of Devonshire had a son and two daughters.