Jonathan Nicholas Powell is a British diplomat who served as the second Downing Street Chief of Staff, under British prime minister Tony Blair from 1997 to 2007. He was the only senior adviser to last the whole period of Blair's leadership. During this period Powell was also the chief British negotiator on Northern Ireland.

Charles David Powell, Baron Powell of Bayswater, is a British diplomat and businessman who served as a key foreign policy adviser to Prime Minister Margaret Thatcher during the 1980s.