Katherine FitzGerald may refer to:
Katherine FitzGerald, Countess of Desmond (died 1604), noblewoman of the Anglo-Norman FitzGerald dynasty in Ireland, famed for her longevity 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