Katherine FitzGerald may refer to:
- Katherine FitzGerald, Countess of Desmond (died 1604), noblewoman of the Anglo-Norman FitzGerald dynasty in Ireland
- Katherine FitzGerald, Viscountess Grandison (1660–1725), wealthy Irish heiress
- Katherine A. Fitzgerald, Irish-born molecular biologist and virologist
- Katherine Fitzgerald, Lady of Hy-Carbery (1452–1506), Anglo-Irish noblewoman
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