Jaz can refer to:
- Jazz music (the spelling with one "z" being mostly used in the 1910s)
- Jaz drive, a disk storage system
- Jaz-O, a rapper known for bringing Jay-Z into the music business
- Jaz Beach, a beach on the Montenegro riviera
- Jaz (island), a Croatian island
- Jaz (beer), Malaysia's only locally brewed beer
- Jaz, alternate spelling of Gaz, Iran, a city in Isfahan Province, Iran