| Xavier Isaac | |
| Office: | Chief of the Joint Chiefs of Staff of the Armed Forces of the Argentine Republic |
| Term Start: | 2 January 2024 |
| Predecessor: | Juan Martín Paleo |
| Office1: | Chief of the General Staff of the Argentine Air Force |
| Term Start1: | 28 February 2020 |
| Term End1: | 2 January 2024 |
| Predecessor1: | Enrique Amrein |
| Successor1: | Fernando Mengo |
| Birth Date: | day=01 month=12 year=1962 |
| Birth Place: | Buenos Aires, Argentina |
| Branch: | Argentine Air Force |
| Allegiance: |  Argentina |
| Rank: | Brigadier general |
| Serviceyears: | 1981–present |
Xavier Julián Isaac (born 1 December 1962)[1] is an Argentine General currently serving as the Chief of the Joint Chiefs of Staff of the Armed Forces of the Argentine Republic. Prior to his appointment, he served as the Chief of the General Staff of the Argentine Air Force