Lord Henry FitzGerald PC (Ire) (30 July 1761 – 9 July 1829) was the fourth son of the 1st Duke of Leinster and the Duchess of Leinster (née Lady Emily Lennox). A younger brother was the revolutionary Lord Edward FitzGerald.
FitzGerald was a Member of Parliament (MP) for Kildare Borough between 1776 and 1783 and represented then Athy between 1790 and 1791. From 1790 to 1798, he sat in the Irish House of Commons for Dublin City. On 8 July 1806, he was appointed to the Privy Council of Ireland, and from 1807 until 1814, Lord Henry served in the Parliament of the United Kingdom for Kildare. He also held the position of one of the joint Postmasters General of Ireland from April 1806 until May 1807. He was a member of the Kildare Street Club in Dublin and died at Boyle Farm, Thames Ditton, on 9 July 1829.
He married Charlotte Boyle Walsingham in London on 3/4 August 1791. Together they lived at Boyle Farm, Thames Ditton. The couple had twelve children; his issue took the surname FitzGerald-de Ros:
Henry William FitzGerald-de Ros, 22nd Baron de Ros (1793–1839)
Lt. Col. Arthur John Hill FitzGerald-de Ros (21 December 1795 – 23 February 1826)
General William Lennox Lascelles FitzGerald-de Ros, 23rd Baron de Ros (1797–1874)
Edmund Emilius Boyle FitzGerald-de Ros (4 May 1799 – 12 September 1810)
RAdm. John Frederick FitzGerald-de Ros (6 March 1804 – 19 June 1861)
Augustus FitzGerald-de Ros (b. 1805), died young
Henrietta Mabel FitzGerald-de Ros (d. 22 December 1879), married on 24 October 1828 John Broadhurst of Foston Hall (d. 1861)
Olivia Cecilia FitzGerald-de Ros (11 January 1807 – London, 21 April 1885), married on 22/23 October 1833 Henry Wellesley, 1st Earl Cowley
Charlotte FitzGerald-de Ros (d. 1813)
Geraldine FitzGerald-de Ros (d. 28 September 1881), married on 25 November 1830 The Rev. Frederic Pare
Cecilia FitzGerald-de Ros (d. 6 October 1869), married on 10 December 1835 The Hon. John Boyle (13 March 1803 - 6 December 1874), son of Edmund Boyle, 8th Earl of Cork and had issue
Jane FitzGerald-de Ros (d. 1885), married Col. Christopher Hamilton MP, and had issue