William Trench, 1st Earl of Clancarty

William Power Keating Trench, 1st Earl of Clancarty (23 June 1741 – 27 April 1805; Ballinasloe, Ireland) was an Irish aristocrat and politician and later United Kingdom statesman at the time of the Act of Union. His family, through his son Richard, became prominent and hereditary members of the Netherlands' nobility.

The son of Richard Trench and Frances Power, William was a Member of Parliament in the Irish House of Commons, and supported the Whigs. He represented Galway County from 1768 until 1797 and served as High Sheriff of County Kilkenny in 1777. He was advanced to the Irish House of Lords as Baron Kilconnel (created 25 November 1797), and to the position of Viscount Dunlo (created 3 January 1801) as a reward for his continuing support of the Whig Party. On 12 February 1803 he became Earl of Clancarty. His choice of the title is derived from his descent from Elena MacCarty, wife of John Power, daughter of Cormac Oge MacCarty, Viscount Muskerry, and sister of Donough MacCarty, 1st Earl of Clancarty. He therefore became the first Earl of Clancarty in its second creation. He was succeeded by his son Richard.

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