John Lysaght, 2nd Baron Lisle of Mountnorth (1729 – 9 January 1798) was an Anglo-Irish aristocrat and a Whig politician in the Irish House of Commons.
He was born in 1729 in Dublin[1] to John Lysaght, and Catherine, daughter of Joseph Deane, by Margaret Boyle, sister of the Earl of Shannon.
The Lysaght family (pronounced Lycett) descended from the ancient Irish House of O'Bryen.
His father was created Baron Lisle in the Peerage of Ireland in 1753.
After the accession of George III in 1760 to the English and Irish thrones, Lysaght was elected as a 'knight of the shire' MP for County Cork for three years in 1765.