List of dukes in the peerages of Britain and Ireland

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 Britain and Ireland.

Three times a woman was created a duchess in her own right; Barbara Palmer, 1st Duchess of Cleveland, chief mistress of Charles II of England, Anne Scott, 1st Duchess of Buccleuch, wife of Charles II's eldest illegitimate son, the Duke of Monmouth, and Cecilia Underwood, Duchess of Inverness, wife of Prince Augustus Frederick, Duke of Sussex, whose marriage was in contravention of the Royal Marriages Act 1772 and therefore she was not allowed to share her husband's rank.

In addition, the Dukedom of Marlborough was once inherited by a woman, the 2nd Duchess of Marlborough, through a special remainder, as happened to the Dukedom of Hamilton when it was inherited by Anne Hamilton, 3rd Duchess of Hamilton and also the royal Dukedom of Fife, which was created for the Earl Fife by Queen Victoria, on the occasion of his marriage to Louise, Princess Royal, eldest daughter of the future King Edward VII.

The first, 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).

Clarence has not been used since 1478, when George (the brother of Edward IV) was executed for treason.