John FitzGerald, Baron FitzGerald

John David FitzGerald, Baron FitzGerald PC, PC (Ire) (1 May 1816 – 16 October 1889) was an Irish judge and Liberal politician.

Born in Dublin, he was the son of the merchant David FitzGerald and his wife Catherine, eldest daughter of David Leahy. His sister Kate was married to Charles Robert Barry and his youngest sister Emily to Denis Caulfield Heron. FitzGerald was educated at Trinity College, Dublin and was called to the bar by King's Inns in 1838. In 1870, he received a Honorary Doctorate of Laws by the University of Dublin.

FitzGerald became a Queen's Counsel in 1847 and was judge of the Munster circuit. He entered the British House of Commons in 1852, sitting for Ennis the next eight years. In 1855, FitzGerald was first elected a Bencher, then nominated Solicitor-General for Ireland. He became Attorney-General for Ireland a year later, on which appointment he was sworn of the Privy Council of Ireland. FitzGerald held the former post until 1858 and after a break for a year, again until 1860, when he was appointed Judge on the Court of Queen's Bench (Ireland). On 23 June 1882, he was created a Lord of Appeal in Ordinary with the title Baron FitzGerald, of Kilmarnock, in the County of Dublin. Six days later, he was additionally sworn of the Privy Council of the United Kingdom.