Lord Robert Spencer (8 May 1747 – 23 June 1831) was a British politician who sat in the House of Commons several times between 1768 and 1818.

[3] At the 1768 general election Spencer was returned as Member of Parliament for New Woodstock on the Marlborough interest.

[3] Spencer was a member of a subscription committee set up to raise funds to support the Whigs in the forthcoming general election.

He did not want to spend £3,000 to buy a seat at Wootton Bassett or risk an expensive contest at Evesham, and did not want to be a liability on his party.

However, he was in financial difficulties in 1799 and lost through gambling again so heavily that he had to sell his London house and pictures.

[4] Spencer was an inveterate gambler and having lost his official salary found himself in financial difficulties around 1781, until he was admitted to a twelfth share in Fox's faro bank at Brooks's, with a fee of five or six guineas an hour.

The circle surrounding Fox included Edward Bouverie, a fellow habitué of Brook's, and his younger wife Harriet, the daughter of Sir Everard Fawkener, K.B.

[6] Spencer married his mistress Harriet Bouverie on 2 October 1811, a year after the death of her husband.