Henry de Burgh, 1st Marquess of Clanricarde, KP, PC (Ire) (/dəˈbɜːr ... klænˈrɪkɑːrd/ də-BUR ... klan-RIK-ard; 8 January 1742 – 8 December 1797), styled Lord Dunkellin (/dʌnˈkɛlɪn/ dun-KEL-in) until 1782 and The Earl of Clanricarde from 1782 until 1789, was an Irish peer and politician who was MP for County Galway (1768) and Governor and Custos Rotulorum of County Galway (1792–97).

Henry was the son of the 11th Earl of Clanricarde, and from 1753 to 1758 was educated at Eton College. In 1768 he was a Member of Parliament in the Irish House of Commons representing County Galway. He succeeded his father as Earl of Clanricarde (among other titles) on 21 April 1782, and became one of the founding Knights of the Order of St Patrick on 5 February 1783,^[1] and on 6 March of the same year was invested as a member of the Privy Council of Ireland.^[2]

From 1792 until his death on 8 December 1797, he was Governor and Custos Rotulorum of County Galway.^[3]

On 17 March 1785, he married Lady Urania Anne Paulet (1766–1843), daughter of George Paulet, 12th Marquess of Winchester, but they had no children. His widow subsequently married, on 28 October 1799, to Col. Peter Kingston (d.1807). She married for the third time, on 22 May 1813, to Admiral The Hon. Sir Joseph Sydney Yorke (1768–1831).^[4]

Country	Date	Appointment	Ribbon	Post-nominals
United Kingdom	1783 – 1797	Knight of the Most Illustrious Order of St Patrick		KP
United Kingdom	1783 – 1797	Member of the Privy Council of Ireland		PC (Ire)

Coat of arms of Henry de Burgh, 1st Marquess of Clanricarde

Crest A Cat-a-Mountain sejant guardant proper, collared and chained Or. Escutcheon Or, a cross gules in the first quarter a lion rampant sable. Supporters Two Cats-a-Mountain sejant guardant proper, collared and chained Or.[5][6] Motto UNG ROY, UNG FOY, UNG LOY (One king, one faith, one law) Orders Order of St Patrick

• House of Burgh, an Anglo-Norman and Hiberno-Norman dynasty founded in 1193

• Burke, John; Burke, Bernard (1844). Encyclopædia of Heraldry: Or General Armory of England, Scotland, and Ireland, Comprising a Registry of All Armorial Bearings from the Earliest to the Present Time, Including the Late Grants by the College of Arms. H. G. Bohn.
• Burke, Bernard (1884). The General Armory of England, Scotland, Ireland, and Wales; comprising a registry of armorial bearings from the earliest to the present time. University of California Libraries. London: Harrison & Sons.
• Cook, Christopher; Stevenson, John, eds. (1980). British Historical Facts, 1760−1830. London and Basingstoke: The Macmillan Press.
• Cokayne, G. E. (1889). The Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom Extant, Extinct, or Dormant (1st ed.). London: George Bell & Sons.