George Montagu, 6th Duke of Manchester DL, known as Viscount Mandeville from 1799 to 1843, was a British peer and Tory Member of Parliament.

Colonel William Montagu, 5th Duke of Manchester, styled Viscount Mandeville until 1788, was a British peer, soldier, colonial administrator and politician. He was Governor of Jamaica from 1808 to 1827, and Manchester Parish was named after him.