Elizabeth FitzGerald (before 1597–1611) was the first wife of Lucas Plunket, who succeeded as Baron Killeen in 1613, and who in due course became the 1st Earl of Fingall in 1628. They lived at Killeen Castle, County Meath in Ireland. She was a daughter of Henry FitzGerald, 12th Earl of Kildare, and therefore sister to Bridget, the Countess of Tyrconnell and wife of Prince Rory O'Donnell, 1st Earl of Tyrconnell.