Youngest person appointed Prime Minister
- Who
- William Pitt
- Where
- United Kingdom (London,)
- When
- 19 December 1783
The youngest Prime Minister to assume office was Hon. William Pitt (1759-1806), who was 24 years 205 days old upon assuming office on 19 December 1783. He had previously declined the premiership when aged 23 years 275d ays.