Lieutenant-General John Manners, Marquess of Granby was a British Army officer, politician and nobleman. The eldest son of John Manners, 3rd Duke of Rutland, as he did not outlive his father and inherit the dukedom, Manners was known by his father's subsidiary title, Marquess of Granby. He served in the military during the Jacobite rising of 1745 and the Seven Years' War, being subsequently rewarded with the post of Commander-in-Chief of the Forces. Manners was popular with the troops who served under him and many British pubs are still named after him today.

John Manners, 3rd Duke of Rutland KG PC was an English nobleman, the eldest son of John Manners, 2nd Duke of Rutland and Catherine Russell. Styled Marquess of Granby from 1711, he succeeded to the title in 1721, cutting short a brief career in the House of Commons, where he had represented Rutland as a Whig.