Marquis of Abercorn

Dukedom of Abercorn
Arms of Duke of Abercorn: Quarterly: 1st & 4th, gules three cinquefoils pierced ermine (for Hamilton); 2nd & 3rd, argent, Argent, a lymphad with the sails furled proper, flagged gules and oars in action sable (for Arran) in the point of honour and over all, an inescutcheon azure with charged three fleur-de-lys or, and surmounted by a French ducal coronet (for Châtellerault)
Creation date	10 August 1868
Monarch	Victoria
Peerage	Peerage of Ireland
First holder	James Hamilton, 2nd Marquess of Abercorn
Present holder	James Hamilton, 5th Duke
Heir apparent	James Hamilton, Marquess of Hamilton
Remainder to	The 1st Duke's heirs male of the body lawfully begotten
Subsidiary titles	Marquess of Abercorn Marquess of Hamilton Earl of Abercorn Viscount Strabane Viscount Hamilton Lord Paisley Lord of Abercorn Lord of Paisley, Hamilton, Mountcastell and Kilpatrick Lord Hamilton, Baron of Strabane Baron Mountcastle Baronet Hamilton of Dunalong
Seat(s)	Baronscourt
Armorial motto	Sola Nobilitas Virtus ("The only nobility is virtue")

The title Duke of Abercorn /ˈævəkɔːn/ is a title in the Peerage of Ireland. It was created in 1868 and bestowed upon James Hamilton, 2nd Marquess of Abercorn. Although the Dukedom is in the Peerage of Ireland, it refers to Abercorn, West Lothian, and the Duke also bears four titles in Peerage of Scotland and two in the Peerage of Great Britain, and is one of only three peers who have titles in those three peerages. The Duke of Abercorn also bears the French title of Duke of Châtellerault, created in 1548.

In acknowledgement of his loyalty, James VI of Scotland (James I of England), conferred on the Hon. Claud Hamilton, third son of James Hamilton, 2nd Earl of Arran, the title Lord Paisley. His son James Hamilton was created Lord Abercorn on 5 April 1603, then on 10 July 1606 he was made Earl of Abercorn and Lord of Paisley, Hamilton, Mountcastell and Kilpatrick.

His successor, the 2nd Earl of Abercorn, was additionally created Lord Hamilton, Baron of Strabane, in the Peerage of Ireland, on 8 May 1617. He resigned this dignity to his younger brother in 1633; the brother's heirs inherited the Earldom and other titles in 1680, in the person of Claud Hamilton, 4th Earl of Abercorn. He was attainted in Ireland in 1691, and the Barony of Strabane forfeited, but his brother Charles Hamilton, 5th Earl of Abercorn, obtained a reversal of the attainder and recovered in 1692.