William George Spencer Cavendish, 6th Duke of Devonshire (21 May 1790 – 18 January 1858), styled Marquess of Hartington until 1811, was an English peer, courtier and Whig politician. Known as the "Bachelor Duke", he served as Lord Chamberlain from 1827 to 1828 and again from 1830 to 1834. The Cavendish banana is named after him.
Background
Born in Paris, France, Devonshire was the son of William Cavendish, 5th Duke of Devonshire, and Lady Georgiana, daughter of John Spencer, 1st Earl Spencer, members of the Cavendish family. He lost both his parents while still in his youth; his mother died in 1806 and his father in 1811 when, aged 21, he succeeded to the dukedom. Along with the title, he inherited eight stately homes and some 200,000 acres (809 km<sup>2</sup> or 80,900 ha) of land.
Political career
thumb|left|The duke carrying the [[Globus cruciger|Orb at the coronation of George IV in 1821.]]
Politically Devonshire followed in the Whig family tradition. He supported Catholic emancipation, the abolition of slavery and reduced factory working hours. He held office as Lord Chamberlain of the Household under George Canning and Lord Goderich between 1827 and 1828 and under Lord Grey and Lord Melbourne between 1830 and 1834. In 1827 he was sworn of the Privy Council and made a Knight of the Garter.
Devonshire was also Lord Lieutenant of Derbyshire between 1811 and 1858 and carried the globus cruciger at George IV's coronation. However, increasing deafness from an early age prevented him from taking an even greater part in public life. It was this interest which led him to establish the Royal Botanic Gardens at Kew as a national botanic garden.
Devonshire was also patron of The Derby Town and County Museum and Natural History Society. In that position, he was instrumental in the creation of the Derby Museum and Art Gallery in 1836.
He also travelled extensively.
In 1845, Cavendish published a book called Handbook to Chatsworth and Hardwick. It was privately printed and provided a history of the Cavendish family's two primary estates: Chatsworth House and Hardwick Hall; the handbook was praised by author Charles Dickens.
Personal life
thumb|left|[[St Peter's Church, Edensor|St Peter's Churchyard, Edensor - grave of William Cavendish, 6th Duke of Devonshire KG, PC (1790–1858)]]thumb|right|Shield of arms of William Cavendish, 6th Duke of Devonshire, KG, PC
Devonshire was a close friend of the Prince Regent.