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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