Walter Kerdiff (died 1557) was an Irish judge and landowner of the sixteenth century.
As his surname suggests his family came originally from Cardiff, but they had long been settled in Ireland, near Finglas in County Dublin, where they are recorded from at least the 1450s.
Walter was the principal landowner in Finglas in the last years of the reign of Henry VIII,[3] and later owned lands at Castleknock, Pelletstown (modern Blanchardstown) and Turvey in County Dublin, and at Shallan in County Meath.
Kerdiff's ownership of such extensive lands suggests that, like most of his colleagues, he had acquired considerable wealth from the Dissolution of the Monasteries, although Kenny notes that there is no firm evidence of this.
[4] Walter was appointed a judge of the Court of Common Pleas (Ireland) in 1535, and served until 1557.