John FitzGerald, 4th Earl of Desmond (died 1399) was the son of Gerald FitzGerald, 3rd Earl of Desmond.

[1][2] He married and had one son, Thomas, who succeeded him as Earl of Desmond.

[1][2] According to Burke, John FitzGerald married Joan Roche, the daughter of Lord Fermoy.

[1] On 4 March 1399, FitzGerald drowned at Ardfinnan on the River Suir, returning from an incursion into the territory of the Earl of Ormond..[3] He was buried at Youghal, and succeeded by his son Thomas FitzJohn FitzGerald, 5th Earl of Desmond.

This biography of an earl in the Peerage of Ireland is a stub.