George Montagu, Duke of Montagu KG, PC, FRS styled Lord Brudenell until 1732 and known as the Earl of Cardigan between 1732 and 1766, was a British peer.

James Brudenell, 5th Earl of Cardigan, styled The Honourable James Brudenell until 1780 and known as The Lord Brudenell between 1780 and 1790, was a British courtier and politician who sat in the House of Commons from 1754 to 1780, when he was raised to the peerage as Baron Brudenell.