Royal dukedoms in the United Kingdom

In the British peerage, a royal duke is a member of the British royal family, entitled to the titular dignity of prince and the style of His Royal Highness, who holds a dukedom. Dukedoms are the highest titles in the British roll of peerage, and the holders of these particular dukedoms are princes of the blood royal. The holders of the dukedoms are royal, not the titles themselves. They are titles created and bestowed on legitimate sons and male-line grandsons of the British monarch, usually upon reaching their majority or marriage. The titles can be inherited but cease to be called "royal" once they pass beyond the grandsons of a monarch. As with any peerage, once the title becomes extinct, it may subsequently be recreated by the reigning monarch at any time.

Royal status of dukedoms
In the United Kingdom, there is nothing intrinsic to any dukedom that makes it "royal". Rather, these peerages are called royal dukedoms because they are created for, and held by, members of the royal family who are entitled to the titular dignity of prince and the style Royal Highness. Although the term "royal duke", therefore, has no official meaning per se, the category "Duke of the Blood Royal" was acknowledged as a rank conferring special precedence at court in the unrevoked 20th clause of the Lord Chamberlain's order of 1520. This decree accorded precedence to any peer related by blood to the sovereign above all others of the same degree within the peerage. The order did not apply within Parliament, nor did it grant precedence above the archbishop of Canterbury or other Great Officers of State such as is now enjoyed by royal dukes. But it placed junior "Dukes of the Blood Royal" above the most senior non-royal duke, junior "Earls of the Blood Royal" above the most senior non-royal earl (cf. Earldom of Wessex), etc. It did not matter how distantly related to the monarch the peers might be (presumably they ranked among each other in order of succession to the Crown). Although the 1520 order is theoretically still in effect, in fact the "Blood Royal" clause seems to have fallen into desuetude by 1917 when King George V limited the style of Royal Highness to children and male-line grandchildren of the sovereign. Thus peers of the blood royal who are neither sons nor grandsons of a sovereign are no longer accorded precedence above other peers.

Assuming that Alexander Windsor, Earl of Ulster and George Windsor, Earl of St Andrews succeed their fathers to become the third Duke of Gloucester and the third Duke of Kent, respectively, their peerages (as created in 1928 and 1934) will cease to be royal dukedoms; instead their holders will become "ordinary" dukes. The third dukes of Gloucester and Kent will each be styled His Grace because, as great-grandsons of King George V, they are not princes and are not styled HRH. Similarly, upon the death of Prince Arthur, Duke of Connaught and Strathearn (1850–1942) (the third son of Queen Victoria), his only male-line grandson, Alastair, Earl of Macduff (1914–43), briefly succeeded to his peerages and was styled His Grace. Before the 1917 changes, his style had been His Highness Prince Alastair of Connaught.

Current royal dukedoms
The current royal dukedoms, held as principal titles, in order of precedence, are: The following dukedoms are currently held by William, Prince of Wales:
 * Duke of Cornwall is a title automatically held by the Sovereign's eldest son in England. In addition to the dukedom of Cornwall, a peerage, the holder also enjoys a life interest in the Duchy of Cornwall.
 * Duke of Rothesay is a title automatically held by the Sovereign's heir apparent in Scotland, who is properly called "HRH The Prince William, Duke of Rothesay" (rather than "HRH The Prince of Wales") in Scotland.
 * Duke of Cambridge is a title which was conferred on the Prince on his wedding day, 29 April 2011.

With the exceptions of the dukedoms of Cornwall and Rothesay (which can only be held by the eldest living son of the sovereign who is also the heir apparent), these dukedoms are hereditary according to the letters patent that created them. Those patents contain the standard remainder to "heirs male of his body", with the exception of the Dukedom of Edinburgh, which is a life peerage and will become extinct on the death of the current Duke. The Dukedom of Edinburgh is the first dukedom created for life in the Royal Family since the granddaughter of Edward I of England, Margaret of Brotherton, was created the Duchess of Norfolk for life (in her own right) in 1397.

By law the British monarch also holds, and is entitled to the revenues of, the Duchy of Lancaster. Within the borders of the County Palatine of Lancashire, therefore, the monarch is hailed as "The King/Queen, The Duke of Lancaster" (even when the monarch is a queen regnant, by tradition she does not use the title Duchess). However, legally the monarch is not the Duke of Lancaster: peerages are in origin held feudally of the sovereign who, as the fount of honour, cannot hold a peerage of him- or herself. The situation is similar in the Channel Islands, where the monarch is addressed as Duke of Normandy, but only in accordance with tradition. He or she does not hold the legal title of Duke of Normandy.

Former royal dukedoms
The following is a list of dukedoms previously created for members of the royal family, but which have subsequently merged in the crown, become extinct or have otherwise ceased to be royal dukedoms.

Suspended dukedoms
Under the Titles Deprivation Act 1917 the holders of the following dukedoms, who were simultaneously British princes and members of royal and princely families of Germany, were deprived of their British titles, having sided with Germany during the First World War. The Act provides that a successor of a person thus deprived of a peerage can petition the Crown for revival of the title. No such descendant has done so.

Royal dukedoms created since 1726
{| class="wikitable" ! Coat of arms ! Title ! Prince ! Date created ! Notes
 * colspan=5|
 * colspan=5|

Reign of King George I
Merged with the Crown in 1760
 * align=center|Coat of Arms of the Hanoverian Princes of Wales (1714-1760).svg
 * Duke of Edinburgh
 * Prince Frederick
 * 15 July 1726
 * Created Prince of Wales in 1729
 * Created Prince of Wales in 1729
 * align=center|Coat of Arms of William Augustus, Duke of Cumberland.svg
 * Duke of Cumberland
 * Prince William
 * 15 July 1726
 * Extinct in 1765
 * colspan=5|
 * colspan=5|
 * colspan=5|

Reign of King George II

 * align=center|Coat of Arms of Edward Augustus, Duke of York and Albany.svg
 * Duke of York and Albany
 * Prince Edward
 * 1 April 1760
 * Extinct in 1767
 * colspan=5|
 * colspan=5|
 * colspan=5|

Reign of King George III

 * align=center|Coat of Arms of William Henry, Duke of Gloucester and Edinburgh.svg
 * Duke of Gloucester and Edinburgh
 * Prince William Henry
 * 17 November 1764
 * Extinct in 1834
 * align=center|Coat of Arms of Henry Frederick, Duke of Cumberland and Strathearn.svg
 * Duke of Cumberland and Strathearn
 * Prince Henry
 * 22 October 1766
 * Extinct in 1790
 * align=center|Coat of Arms of Frederick Augustus, Duke of York and Albany.svg
 * Duke of York and Albany
 * Prince Frederick
 * 27 November 1784
 * Extinct in 1827
 * align=center|Coat of Arms of William Henry, Duke of Clarence.svg
 * Duke of Clarence and St Andrews
 * Prince William
 * 19 May 1789
 * Merged with the Crown in 1830
 * align=center|Coat of Arms of Edward Augustus, Duke of Kent and Strathearn.svg
 * Duke of Kent and Strathearn
 * Prince Edward
 * rowspan=2|23 April 1799
 * Extinct in 1820
 * align=center|Coat of Arms of Ernest Augustus, Duke of Cumberland and Teviotdale.svg
 * Duke of Cumberland and Teviotdale
 * Prince Ernest Augustus
 * Deprived in 1919
 * align=center|Coat of Arms of Augustus Frederick, Duke of Sussex.svg
 * Duke of Sussex
 * Prince Augustus Frederick
 * rowspan=2|24 November 1801
 * Extinct in 1843
 * align=center|Coat of Arms of Adolphus Frederick, Duke of Cambridge.svg
 * Duke of Cambridge
 * Prince Adolphus
 * Extinct in 1904
 * colspan=5|
 * rowspan=2|24 November 1801
 * Extinct in 1843
 * align=center|Coat of Arms of Adolphus Frederick, Duke of Cambridge.svg
 * Duke of Cambridge
 * Prince Adolphus
 * Extinct in 1904
 * colspan=5|
 * colspan=5|
 * colspan=5|

Reign of Queen Victoria
Merged with the Crown in 1910
 * align=center|Coat of Arms of Alfred, Duke of Edinburgh.svg
 * Duke of Edinburgh
 * Prince Alfred
 * 24 May 1866
 * Extinct in 1900
 * align=center|Coat of Arms of Arthur, Duke of Connaught and Strathearn, until 1917.svg
 * Duke of Connaught and Strathearn
 * Prince Arthur
 * 24 May 1874
 * Extinct in 1943
 * align=center|Coat of Arms of Leopold, Duke of Albany.svg
 * Duke of Albany
 * Prince Leopold
 * 24 May 1881
 * Deprived in 1919
 * align=center|Coat of Arms of Albert, Duke of Clarence and Avondale.svg
 * Duke of Clarence and Avondale
 * Prince Albert Victor
 * 24 May 1890
 * Extinct in 1892
 * align=center|Coat of Arms of George, Duke of York.svg
 * Duke of York
 * Prince George
 * 24 May 1892
 * Created Prince of Wales in 1901
 * align=center|Coat of Arms of George, Duke of York.svg
 * Duke of York
 * Prince George
 * 24 May 1892
 * Created Prince of Wales in 1901
 * colspan=5|
 * colspan=5|

Reign of King George V

 * align=center|Coat of Arms of Albert, Duke of York.svg
 * Duke of York
 * Prince Albert
 * 3 June 1920
 * Merged with the Crown in 1936
 * align=center|Coat of Arms of Henry, Duke of Gloucester.svg
 * Duke of Gloucester
 * Prince Henry
 * 30 March 1928
 * Extant
 * align=center|Coat of Arms of George, Duke of Kent.svg
 * Duke of Kent
 * Prince George
 * 9 October 1934
 * Extant
 * colspan=5|
 * 9 October 1934
 * Extant
 * colspan=5|
 * colspan=5|

Reign of King George VI

 * align=center|Coat of Arms of Edward, Duke of Windsor.svg
 * Duke of Windsor
 * Prince Edward
 * 8 March 1937
 * Extinct in 1972
 * align=center|Coat of Arms of Philip, Duke of Edinburgh.svg
 * Duke of Edinburgh
 * Prince Philip
 * 20 November 1947
 * Merged with the Crown in 2022
 * colspan=5|
 * Merged with the Crown in 2022
 * colspan=5|
 * colspan=5|

Reign of Queen Elizabeth II
Extant
 * align=center|Coat of Arms of Andrew, Duke of York.svg
 * Duke of York
 * Prince Andrew
 * 23 July 1986
 * Extant
 * align=center|Coat of Arms of William, Duke of Cambridge.svg
 * Duke of Cambridge
 * Prince William
 * 29 April 2011
 * Created Prince of Wales in 2022
 * 29 April 2011
 * Created Prince of Wales in 2022
 * align=center|Coat of Arms of Harry, Duke of Sussex.svg
 * Duke of Sussex
 * Prince Henry (Harry)
 * 19 May 2018
 * Extant
 * colspan=5|
 * colspan=5|
 * colspan=5|

Reign of King Charles III

 * align=center|Coat of Arms of Edward, Earl of Wessex.svg
 * Duke of Edinburgh
 * Prince Edward
 * 10 March 2023
 * Extant
 * }
 * }

Forms of address

 * Address: His/Her Royal Highness The Duke/Duchess of (X)
 * Speak to as: Your Royal Highness
 * After: Sir/Madam

Coronet
While non-royal dukes are entitled to a coronet of eight strawberry leaves, to bear at a coronation and on his coat of arms, royal dukes are entitled to princely coronets (four cross pattées alternating with four strawberry leaves). The coronets of the royal family are dictated by letters patent. The Dukes of Sussex, of York and of Edinburgh bear by letters patent the coronet of a child of the sovereign (four crosses patées alternating with four fleurs-de-lis), while the Duke of Cornwall, Rothesay and Cambridge has use of the Prince of Wales' coronet, and the current dukes of Gloucester and of Kent, as grandsons of a sovereign bear the corresponding coronet of a royal duke.

At coronations, apart from the differentiation of princely coronets from ducal coronets, a royal duke is also entitled to six rows of ermine spots on his mantle, as opposed to the four rows borne by an "ordinary" duke.