He served as Prime Minister from 1783 to 1801, and again from 1804 until his death. He is known as William Pitt the Younger to distinguish him from his father, William Pitt the Elder, who also served as Prime Minister of Great Britain.
- Encyclopædia Britannica Eleventh Edition. Pitt, William. (1910–1911).
- William Pitt the Younger on the 10 Downing Street website