| Dukedom of Cumberland and Teviotdale | |
| Creation Date: | 24 April 1799 |
| Remainder To: | the 1st Duke's heirs male of the body lawfully begotten |
| Subsidiary Titles: | Earl of Armagh |
| Status: | Suspended on 28 March 1919 under the Titles Deprivation Act 1917 |
Duke of Cumberland and Teviotdale was a title in the Peerage of Great Britain that was held by junior members of the British royal family. It was named after the county of Cumberland in England, and after Teviotdale in Scotland. Held by the Hanoverian royals, it was suspended under the Titles Deprivation Act 1917, which revoked titles belonging to enemies of the United Kingdom during the Great War.
The title Duke of Cumberland had been created three times in the Peerages of England and Great Britain.
In 1799, the double dukedom of Cumberland and Teviotdale, in the Peerage of Great Britain, was bestowed on Ernest Augustus (later King of Hanover), fifth son of King George III of the United Kingdom. In 1837, Ernest became king of Hanover, and on his death in 1851 the title descended with the kingdom to his son King George V, and on George's death in 1878 to his grandson Prince Ernest Augustus, Crown Prince of Hanover. In 1866, Hanover was annexed by Prussia, but King George died without renouncing his rights. His son Ernest, while maintaining his claim to the kingdom of Hanover, was generally known by his title of Duke of Cumberland in Britain.
The title was suspended for Ernest's pro-German activities during World War I under the Titles Deprivation Act 1917, as it was for his son. Under the Act, the lineal male heirs of the 3rd Duke of Cumberland and Teviotdale have the right to petition the British Crown for the restoration of his peerages. To date, none has done so. The present heir is Prince Ernst August of Hanover (born 26 February 1954), great grandson of the 3rd Duke and current head of the House of Hanover. He is the senior male-line descendant of George III of the United Kingdom.
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 Ernest Augustus
House of Hanover
1799–1851
also: Earl of Armagh (1799) || || 5 June 1771
Buckingham Palace
son of King George III and Queen Charlotte || Duchess Frederica of Mecklenburg-Strelitz
1815
3 children || 18 November 1851
Hanover
aged 80|-| Prince George
House of Hanover
1851–1878
also: Earl of Armagh (1799) || || 27 May 1819
Berlin
son of Prince Ernest Augustus and Princess Frederica || Princess Marie of Saxe-Altenburg
1843
3 children || 12 June 1878
Paris
aged 59|-| Prince Ernest Augustus
House of Hanover
1878–1919
also: Earl of Armagh (1799) || || 21 September 1845
Hanover
son of Prince George and Princess Marie || Princess Thyra of Denmark
1878
6 children || 14 November 1923
Gmunden
aged 78
|}The Titles Deprivation Act 1917 suspended the title on 28 March 1919.