Premiership of William Pitt

Premiership of William Pitt may refer to:
 * Premiership of William Pitt, 1st Earl of Chatham, as prime minister of Great Britain, 1766–1768
 * First premiership of William Pitt the Younger, as prime minister of Great Britain and the United Kingdom, 1783–1801
 * Second premiership of William Pitt the Younger, as prime minister of the United Kingdom, 1804–1806