William Arthur Charles Cavendish-Bentinck, 6th Duke of Portland, KG, GCVO, GCStJ, TD, PC, DL (28 December 1857 – 26 April 1943) was a British landowner, courtier, and Conservative politician.

[1] Portland initially embarked on a military career and served as a lieutenant in the Coldstream Guards[2] from 1877 to 1880, and then as lieutenant-colonel of the part-time Honourable Artillery Company from 1881 to 1889.

[3] In 1900 he was appointed a Knight Companion of the Garter,[10] receiving the insignia in an investiture by Queen Victoria at Windsor Castle on 16 March 1900.

The Portlands received Archduke Franz Ferdinand of Austria at Welbeck Abbey for a week in 1913 when the heir to the Austro-Hungarian throne visited England.

During the stay he took the Archduke shooting on the estate when, according to Portland's memoirs, Men, Women and Things: "One of the loaders fell down.

[citation needed] At the coronation of King George VI Portland carried the crown of Queen Elizabeth, whose mother (the Countess of Strathmore and Kinghorne) was his cousin.

It was at his estate in Langwell that the Sunderland Flying boat carrying the Duke of Kent (the King's youngest brother) crashed while en route to a RAF Base in Iceland.

in 1890 Portland built "The Winnings", a row of 6 almshouses at Welbeck Abbey, with the proceeds of his horse racing successes.