| Dukedom of Northumberland | |
|---|---|
 Arms of Percy, Dukes of Northumberland: Quarterly: 1st and 4th grandquarters: 1st and 4th counterquartered: 1st and 4th, Or a Lion rampant Azure (Brabant and Lovaine, Percy modern); 2nd and 3rd, Gules three Lucies hauriant Argent (Lucy); 2nd and 3rd, Azure five Fusils conjoined in fess Or (Percy ancient); 2nd and 3rd grandquarters: quarterly: 1st and 4th, Or three Bars wavy Gules (Drummond); 2nd and 3rd, Or a Lion's Head erased within a Double Tressure flory counterflory Gules (Drummond, coat of augmentation). | |
| Creation date | 1766 |
| Creation | Third |
| Created by | King George III |
| Peerage | Peerage of Great Britain |
| First holder | Hugh Percy, 1st Duke of Northumberland |
| Present holder | Ralph Percy, 12th Duke of Northumberland |
| Heir apparent | George Percy, Earl Percy |
| Remainder to | the 1st Duke's heirs male of the body lawfully begotten |
| Subsidiary titles | Earl of Northumberland Earl Percy Earl of Beverley Baron Warkworth Baron Lovaine Baronet, of Stanwick |
| Extinction date | 1553 (first creation) 1683 (second creation) |
| Seat(s) | Alnwick Castle Syon House |
| Former seat(s) | Warkworth Castle Prudhoe Castle Kielder Castle Northumberland House Stanwick Park Albury Park |
Duke of Northumberland is a noble title that has been created three times in English and British history, twice in the Peerage of England and once in the Peerage of Great Britain. The current holder of this title is Ralph Percy, 12th Duke of Northumberland.