Augustus Frederick FitzGerald, 3rd Duke of Leinster

Augustus Frederick FitzGerald, 3rd Duke of Leinster, etc. PC PC (Ire) (21 August 1791 – 10 February/October 1874) was an Irish peer and freemason, styled Marquess of Kildare from birth until 1804. He was born and died in Carton House.

FitzGerald was the eldest surviving son of William FitzGerald, 2nd Duke of Leinster and his wife, Emilia. He inherited his father's dukedom in 1804. On 16 June 1818, Leinster married Lady Charlotte Augusta Stanhope (15 February 1793 – 15 February 1859), the third daughter of Charles Stanhope, 3rd Earl of Harrington. They had four children:

In 1813, he was chosen Grandmaster of the Grand Lodge of Ireland, a post he held until his death in 1874. Leinster was appointed Custos Rotulorum of Kildare in 1819 and Lord Lieutenant of Kildare in 1831, holding both posts for life. In 1831, he was admitted to the Privy Council of Ireland and to the Privy Council of Great Britain and was Lord High Constable of Ireland at the coronations of William IV and Queen Victoria. He was a Commissioner of National Education for Ireland from 1836 to 1841.

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