List of dukes in the peerages of Britain and Ireland
This is a list of present and extant dukes in the peerages of the Kingdom of England, Kingdom of Scotland, Kingdom of Great Britain, Kingdom of Ireland, United Kingdom of Great Britain and Ireland, and the United Kingdom of Great Britain and Northern Ireland 1927 and after. For a more complete historical listing, including extinct, dormant, abeyant, forfeit dukedoms in addition to these extant ones, see List of dukedoms in the peerages of the British Isles.
Order of precedence 
The general order of precedence among dukes is:
- Dukes in the Peerage of England, in order of creation
- Dukes in the Peerage of Scotland, in order of creation
- Dukes in the Peerage of Great Britain, in order of creation
- Dukes in the Peerage of Ireland created before 1801, in order of creation
- Dukes in the Peerage of the United Kingdom and Dukes in the Peerage of Ireland created after 1801, in order of creation
- The Sovereign's Grace may accord any peer higher precedence than his date of creation would warrant.
- The royal dukes are Dukes of the United Kingdom; but they rank higher in the order of precedence than the age of their titles would suggest, due to their close relationship to the monarch. The Prince of Wales holds precedence above all dukes, royal and non-royal and is the Duke of Cornwall and of Rothesay.
- Dukes in the Peerage of Ireland whose dukedoms were created after 1801 yield precedence to earlier created Dukes of the United Kingdom. However, only one dukedom in this category is still extant, the dukedom of Abercorn.
- In the peerage of England, the title of Duke was created 74 times (using 40 different titles: the rest were recreations). Twice a woman was created a Duchess in her own right (but only for life). Out of the 74 times, 37 titles are now extinct (including the two women), 16 titles were forfeit or surrendered, 10 were merged with the crown, and 10 are extant (see list below). The last, Cornwall, is a title that automatically goes to the heir apparent (if and only if he is also the eldest living son of the Sovereign). One of the duchies that was merged into the crown, Lancaster, still provides income to the sovereign. All but one of the titles became extinct before 1800 (only the Duke of Leeds became extinct in 1964). The last English dukedom to be forfeit became so in 1715.
- The original six titles created between 1337 and 1386 were Duke of Cornwall, Duke of Lancaster, Duke of Clarence, Duke of York, the Duke of Gloucester, and the Duke of Ireland. The Duke of Ireland was a title used for only two years and is somewhat confusing since only a small portion of Ireland was really under the control of England in 1386; it is not to be confused with the dukedoms of the peerage of Ireland. Clarence has not been used since 1892 when Victoria's grandson (and son of the Prince of Wales) died at the age of 28. The titles of Duke of York and the Duke of Gloucester have both become extinct more than once and been re-created as titles within the peerage of the United Kingdom. Both titles are reserved for princes (and their descendants).
- On 29 September 1397, in an unprecedented move six dukedoms were created on a single day. None of these titles is extant.
- Besides the dukedom of Cornwall, the oldest extant title is that of Duke of Norfolk, dating from 1483. The Duke of Norfolk is considered the Premier Duke.
Dukes in the Peerage of England 
- The Duke of Cornwall (1337)
- The Duke of Norfolk (1483 or 1514)
- The Duke of Somerset (1547)
- The Duke of Richmond, Lennox, and Gordon (1675)
- The Duke of Grafton (1675)
- The Duke of Beaufort (1682)
- The Duke of St Albans (1684)
- The Duke of Bedford (1694)
- The Duke of Devonshire (1694)
- The Duke of Marlborough (1702)
- The Duke of Rutland (1703)
Dukes in the Peerage of Scotland 
- The Duke of Rothesay (1398)
- The Duke of Hamilton and Brandon (1643)
- The Duke of Buccleuch and Queensberry (1663)
- The Duke of Argyll (1701)
- The Duke of Atholl (1703)
- The Duke of Montrose (1707)
- The Duke of Roxburghe (1707)
Dukes in the Peerage of Great Britain 
- The Duke of Manchester (1719)
- The Duke of Northumberland (1766)
Dukes in the Peerage of the Kingdom of Ireland 
- The Duke of Leinster (1766)
- The Duke of Abercorn (1868)1
Dukes in the Peerage of the United Kingdom 
- Precedence of Irish creations shown in italics.
- The Duke of Wellington (1814)
- The Duke of Sutherland (1833)
- The Duke of Abercorn
- The Duke of Westminster (1874)
- The Duke of Fife (1900)
- The Duke of Gloucester (1928)
- The Duke of Kent (1934)
- The Duke of Edinburgh (1947)
- The Duke of York (1986)
- The Duke of Cambridge (2011)
2As members of the Royal Family, these dukes rank higher in precedence than they would by virtue of the seniority of their dukedoms alone.
List of eldest sons of Dukes in the Peerages of the British Isles 
- HRH The Prince of Wales, eldest son of the Duke of Edinburgh
- HRH The Duke of Cambridge, eldest son of the Duke of Cornwall and Rothesay
- Earl of Arundel, eldest son of the Duke of Norfolk
- Baron Seymour, eldest son of the Duke of Somerset
- Earl of March and Kinrara, eldest son of the Duke of Richmond, Lennox and Gordon
- Marquess of Worcester, eldest son of the Duke of Beaufort
- Earl of Burford, eldest son of the Duke of St Albans
- Marquess of Tavistock, eldest son of the Duke of Bedford
- Earl of Burlington, eldest son of the Duke of Devonshire (although heirs to that dukedom usually use the greater courtesy title of Marquess of Hartington)
- Marquess of Blandford, eldest son of the Duke of Marlborough
- Marquess of Granby, eldest son of the Duke of Rutland
- Marquess of Douglas and Clydesdale, eldest son of the Duke of Hamilton
- Earl of Dalkeith, eldest son of the Duke of Buccleuch and Queensberry
- Marquess of Lorne, eldest son of the Duke of Argyll
- Marquess of Tullibardine, eldest son of the Duke of Atholl
- Marquess of Graham, eldest son of the Duke of Montrose
- Marquess of Bowmont and Cessford, eldest son of the Duke of Roxburghe
- Viscount Mandeville, eldest son of the Duke of Manchester
- Earl Percy, eldest son of the Duke of Northumberland
- Marquess of Douro, eldest son of the Duke of Wellington
- Marquess of Stafford, eldest son of the Duke of Sutherland
- Marquess of Hamilton, eldest son of the Duke of Abercorn
- Earl Grosvenor, eldest son of the Duke of Westminster
- Earl of Southesk, eldest son of the Duke of Fife
- Earl of Ulster, eldest son of the HRH Duke of Gloucester
- Earl of St Andrews, eldest son of HRH Duke of Kent