| John FitzGerald | |
| Earl of Desmond | |
| Tenure: | 1398-1399 |
| Predecessor: | Gerald FitzMaurice FitzGerald |
| Successor: | Thomas FitzJohn FitzGerald |
| Spouse: | Mary Bourke or Joan of Fermoy |
| Parents: | Gerald FitzMaurice FitzGerald Eleanor Butler |
| Issue: | Thomas FitzJohn FitzGerald Aveline (or Eleanor) |
| Death Date: | 4 March 1399 |
| Death Place: | Ardfinnan |
| Resting Place: | Youghal |
| Death Cause: | drowning |
| Nationality: | Hiberno-Norman |
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.[1]