| Creation Date: | 19 November 1764 |
| Remainder To: | the 1st Duke's heirs male of the body lawfully begotten |
| Status: | Extinct |
| Extinction Date: | 30 November 1834 |
Duke of Gloucester and Edinburgh was a British title (after Gloucester and Edinburgh) in the Peerage of Great Britain; the sole creation carried with it the subsidiary title of Earl of Connaught.
It existed for the brother of King George III, Prince William Henry; there had been Dukedoms of Gloucester and of Edinburgh but their extinction gave the opportunity for combination.
The dukedom of Gloucester and Edinburgh was a royal dukedom when the duke was entitled to the style "His Royal Highness", as Prince William Henry was, but Prince William Frederick was only granted this style on his marriage in 1816.[1]
After the Union of Great Britain, the Hanoverian kings liked to grant double titles (one from one constituent country, one from another) to emphasise unity.| Prince William Henry
House of Hanover
1764–1805
also: Earl of Connaught| | 25 November 1743
Leicester House
son of Frederick, Prince of Wales and Princess Augusta of Saxe-Gotha| Maria Walpole
1766
3 children| 25 August 1805
Gloucester House
aged 61
|-| Prince William Frederick
House of Hanover
1805–1834
also: Earl of Connaught| | 15 January 1776
Teodoli Palace
son of Prince William Henry and Maria Walpole| Princess Mary of the United Kingdom
(his first cousin)
1816
no children| 30 November 1834
Bagshot Park
aged 58|-| colspan=5|William Frederick had no children and all his titles became extinct on his death.|}