Viscount Mount Cashell was a title that was created twice in the Peerage of Ireland. The first creation came in 1706 in favour of Paul Davys. He was made Baron Mount Cashell at the same time, also in the Peerage of Ireland. The titles became extinct on the death of the third Viscount in 1736. The second creation came in 1766 in favour of Stephen Moore. For more information on this creation, see Earl Mount Cashell.