He was the older son of Maurice FitzGerald, 14th Knight of Kerry, and his wife Elizabeth Crosbie, second daughter of David Crosbie.
[3] In 1728, FitzGerald entered the Irish House of Commons and sat for Dingle until his death.
[1] One year later, he succeeded his father as Knight of Kerry.
[3] On 12 April 1732, FitzGerald married Margaret Deane, youngest daughter of Joseph Deane, Chief Baron of the Irish Exchequer, and by her, he had a daughter and a son.
[2] FitzGerald died at The Grove, Dingle in 1741 and was succeeded in his title by his only son Maurice.