The title of Earl of Blessington was created twice in the Peerage of Ireland, in 1745 and 1816. Both creations became extinct, in 1769 and 1829 respectively.
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Anne Boyle, sister of the last Viscount Blessington, married William Stewart, 2nd Viscount Mountjoy, and their son William, 3rd Viscount Mountjoy, was created Earl of Blessington, in the Peerage of Ireland, on 7 December 1745. This title became extinct on his death on the 14 August 1769. It was usually spelt by contemporaries as "Earl of Blesinton".
The Earldom was recreated on 22 January 1816 for Charles John Gardiner, 2nd Viscount Mountjoy, a descendant of the Stewart Viscounts Mountjoy, though not of the Boyle Viscounts Blessington. He died on 25 May 1829, when his titles became extinct.