Earl of Carysfort was a title in the Peerage of Ireland. It was created in 1789 for John Proby, 2nd Baron Carysfort. The Proby family descended from Sir Peter Proby, Lord Mayor of London in 1622. His great-great-grandson John Proby represented Huntingdonshire and Stamford in the House of Commons. His son and namesake John Proby was a Whig politician and notably served as a (civilian) Lord of the Admiralty. In 1752 he was raised to the Peerage of Ireland as Baron Carysfort, of Carysfort in the County of Wicklow. He was succeeded by his son, the second Baron. He was also a politician and was created Earl of Carysfort in the Peerage of Ireland in 1789. In 1801 he was further honoured when he was made Baron Carysfort, of the Hundred of Norman Cross in the County of Huntingdon, in the Peerage of the United Kingdom, which gave him a seat in the British House of Lords. His eldest son and heir apparent, William Proby, Lord Proby, predeceased him.