John George Vanderbilt Henry Spencer-Churchill, 11th Duke of Marlborough, JP, DL (13 April 1926 – 16 October 2014) was a British peer.

He was educated at Eton College and served seven years in the Life Guards, in which he achieved the rank of captain.

To fund the maintenance of the house, he opened it to visitors and as a film set, and established a number of businesses, including a garden furniture company and a water bottling plant.

[1] He was also active in a range of organisations, including the Thames and Chilterns Tourist Board and Oxford United Football Club.

[4] Finally, at the age of 82, Marlborough married Lily Mahtani (née Sahni; born c. 1954–57 in Iran) 3 December 2008 in the Private Chapel at Blenheim.