Barry Yelverton, 1st Viscount Avonmore, PC (Ire) KC (28 May 1736 – 19 August 1805), was an Irish judge and politician, who gave his name to Yelverton's Act 1782, which effectively repealed Poynings' Law and thus restored the independence of the Parliament of Ireland. This achievement was destroyed by the Act of Union 1800, which Yelverton supported. By doing so, he gravely harmed his reputation for integrity, which had already been damaged by his leading role in the conviction and execution for treason of the United Irishman William Orr, which is now seen as a major miscarriage of justice.