Ralph de Cromwell, 3rd Baron Cromwell was an English politician and diplomat. A Privy Councillor from 1422, he served as Treasurer of England (1433–1443) and twice as Chamberlain of the Household during the reign of Henry VI.

The Lord Chamberlain of the Household is the most senior officer of the Royal Household of the United Kingdom, supervising the departments which support and provide advice to the Sovereign of the United Kingdom while also acting as the main channel of communication between the Sovereign and the House of Lords. The office organises all ceremonial activity such as garden parties, state visits, royal weddings, and the State Opening of Parliament. They also oversee the Royal Mews and Royal Travel, as well as the ceremony around the awarding of honours.