Viscount Lisburne is a title that has been created twice, both times in the Peerage of Ireland.
The first creation came in 1685 in favour of Adam Loftus, along with the subsidiary title of Baron of Rathfarnam. These titles became extinct upon his death in 1691.
The second creation came in 1695 in favour of John Vaughan. For more information on this creation, see Earl of Lisburne.