| Honorific Prefix: | The Right Honorable |
| Lord Henry FitzGerald | |
| Honorific-Suffix: | PC (Ire) |
| Constituency Mp: | Kildare Borough |
| Parliament: | Dublin |
| Alongside: | Simon Digby |
| Term Start: | 1783 |
| Term End: | 1790 |
| Constituency Mp2: | Athy |
| Parliament2: | Dublin |
| Alongside2: | Arthur Ormsby |
| Term Start2: | 1790 |
| Term End2: | 1791 |
| Parliament3: | Dublin |
| Alongside3: | Henry Grattan |
| Term Start3: | 1790 |
| Term End3: | 1797 |
| Constituency Mp4: | Kildare |
| Parliament4: | United Kingdom |
| Alongside4: | Robert Latouche |
| Term Start4: | 1807 |
| Term End4: | 1814 |
| Party: | Whig |
| Birth Date: | 1761 7, df=y |
| Death Place: | Boyle Farm, Thames Ditton, England |
| Father: | James FitzGerald, 1st Duke of Leinster |
| Mother: | Lady Emily Lennox |
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 joined the British Army and became a lieutenant in the 66th Foot in 1788, transferring as a captain in 1779 to the newly raised 85th Foot, which was posted to garrison duty in Jamaica for the duration the American Revolutionary War. He was there promoted to major in 1781 and lieutenant-colonel in 1783, taking over command of the regiment from General Charles Stanhope, 3rd Earl of Harrington. After the 85th was disbanded in 1783 he became a captain and lieutenant-colonel in the 2nd Foot Guards in 1789 and retired from active service in 1792.[1]
He was a Member of Parliament (MP) for Kildare Borough between 1783 and 1790 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.[1]
He was a member of the Kildare Street Club in Dublin[2] 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 (Note: List below contains 13 Children); his issue took the surname FitzGerald-de Ros: