Castle Oliver (also Clonodfoy) is a Victorian mock castle in the south part of County Limerick, Ireland. Built for entertaining rather than for defense, it has a ballroom, drawing room, library, morning room, dining room and hall which feature hand-painted ceilings, decorated ornamental corbels, superbly executed stained glass windows and stencil work. The castle stands on massive terraces and has a commanding view over much of its former 20,000-acre (81 km2) estate. The castle has Ireland's largest wine cellar, said to hold approximately 55,000 bottles. From May to September 2014, Castle Oliver was opened to the public in conjunction with "Limerick City of Culture" for house tours.
The lands where the castle stands were settled in about 1658 by Capt. Robert Oliver, one of Oliver Cromwell's soldiers. The present castle replaced the former Castle Oliver, which stood a thousand yards to the south-west and was the birthplace of Eliza Oliver, mother of the notorious Lola Montez, who became the lover and favourite of King Ludwig I of Bavaria.
The castle was for many years known as Clonodfoy, a contraction of an earlier Irish place name: Cloch an Otbhaidhigh, meaning 'the stone structure of Otway', Otway being an Anglo-Norman family name.
Capt. Robert Oliver's descendant Richard Oliver married a Yorkshire heiress through whom he inherited substantial wealth and property in West Yorkshire and moved away to live in Parlington Hall near Wetherby, leaving Castle Oliver to deteriorate in the hands of a bailiff. Their daughters, Mary Isabella and Elizabeth Oliver Gascoigne, both married members of the Trench family of Woodlawn, Galway. The younger sister, Elizabeth, married Frederic Mason Trench, 2nd Baron Ashtown in 1852. The sisters were highly accomplished artisans, designing and executing both the stained glass work and verre eglomise (back-painted glass panels) which ornamented the ballroom fireplace. Much of their work has survived. The elder sister, Mary Isabella, was a highly skilled wood-turner who published (under a male pseudonym) an authoritative book on the subject, "The Art of Wood-Turning", still a respected source of information on the subject.