William Cavendish-Bentinck, 6th Duke of Portland

His Grace The Duke of Portland KG GCVO GCStJ TD PC DL
The Duke of Portland, circa 1900.
Master of the Horse
In office 9 August 1886 – 11 August 1892
Monarch	Queen Victoria
Prime Minister	The Marquess of Salisbury
Preceded by	The Earl of Cork
Succeeded by	The Viscount Oxenbridge
In office 16 July 1895 – 4 December 1905
Monarchs	Queen Victoria Edward VII
Prime Minister	The Marquess of Salisbury Arthur Balfour
Preceded by	The Earl of Cork
Succeeded by	The Earl of Sefton
Personal details
Born	28 December 1857 Dunkeld, Perthshire, Scotland
Died	26 April 1943(1943-04-26) (aged 85) Welbeck Abbey, Nottinghamshire, England
Nationality	British
Political party	Conservative
Spouse	Winifred Dallas-Yorke ​ ​ (m. 1889)​
Children	Lady Victoria Erskine-Wemyss William Cavendish-Bentinck, 7th Duke of Portland Lord Francis Cavendish-Bentinck

William John Arthur Charles James Cavendish-Bentinck, 6th Duke of Portland, KG, GCVO, GCStJ, TD, PC, DL (28 December 1857 – 26 April 1943), known as William Cavendish-Bentinck until 1879, was a British landowner, courtier, and Conservative politician. He notably served as Master of the Horse between 1886 and 1892 and again between 1895 and 1905.