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.

The Parish of Manchester is a parish located in west-central Jamaica, in the county of Middlesex. Its capital, Mandeville, is a major business centre. Its St. Paul of the Cross Pro-Cathedral is the episcopal see of the Latin Catholic Diocese of Mandeville.