Cornelius O'Callaghan, 1st Baron Lismore (7 January 1741 – 12 July 1797), was an Irish politician and peer.
He served in the Irish House of Commons as the Member of Parliament for Fethard, County Tipperary, between 1768 and 1785.
[1] On 27 June 1785 he was made Baron Lismore, of Shanbally, in the Peerage of Ireland, and assumed his seat in the Irish House of Lords.
One of Lord Lismore's daughters, Louisa, married William Cavendish and was the mother of The 7th Duke of Devonshire.
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