Lismore Castle is situated at Lismore, Co Waterford, Ireland and is one of the family seats of the Devonshire family. The Lismore Castle estate came into the family through marriage with the Boyles, Earls of Cork and Burlington, who had in turn bought it from Sir Walter Raleigh in 1602. Lismore is of medieval origins, built by the Bishops of Waterford, but was a ruin when Lord Cork/Burlington acquired it. He restored it, however, only to see its destruction during the Civil War. It was again restored by his son but the aspect it wears today dates from the 6th Duke's time, who 'reigned' from 1811 to 1858. He employed William Atkinson between 1812 and 1822 as architect and in the 1850s Augustus Welby Pugin and Frederick Crace on the internal features. Paxton also carried out work on Lismore – to perhaps a surprising degree considering the scale of his commitments at Chatsworth and elsewhere, such as the Crystal Palace.

Lismore Castle gardens are open to the public from mid-April to early October and the castle can also rented by private groups when the Duke is not in residence.