Dukedom of Clarence and St Andrews
Creation date	20 May 1789
Created by	George III
Peerage	Peerage of Great Britain
First holder	Prince William Henry
Last holder	Prince William Henry
Subsidiary titles	Earl of Munster
Status	Extinct – Merged with the Crown on succeeding as King William IV
Extinction date	26 June 1830

Duke of Clarence and St Andrews was a title awarded to a prince of the British Royal family. The creation was in the Peerage of Great Britain.^[1]

While there had been several creations of Dukes of Clarence (and there was later a Duke of Clarence and Avondale), the only creation of a Duke of Clarence and St Andrews was in 1789 for Prince William, third son of King George III. When William succeeded his brother to the throne in 1830, the dukedom merged in the crown.

See also Earl of Munster (1789)

Duke	Portrait	Birth	Marriage(s)	Death
Prince William Henry House of Hanover 1789–1830		21 August 1765 Buckingham House, London son of George III and Charlotte of Mecklenburg-Strelitz	Adelaide of Saxe-Meiningen 11 July 1818	20 June 1837 Windsor Castle, Windsor aged 71
Prince William Henry ascended as William IV in 1830 upon his brother's death; and his hereditary titles merged in the Crown. As William had no male issue, the title would have gone extinct in any case, even if he had not become king.