HAV or hav may be:
- The Hepatitis A virus.
- Hand arm vibrations
- Hallux Abducto Valgus, a bunion anomaly
- Hav, a fictional city in the novel Last Letters from Hav by Jan Morris
- The IATA airport code for José Martà International Airport in Havana, Cuba.
- The .hav file extension, short for High-quality Audio Video
- Havre (Amtrak station), Montana, United States Amtrak station code HAV
- Hybrid Air Vehicles, UK manufacturer of lighter-than-air vehicles
- HAV, former Okiniwa, Japan rock band
- An abbreviation for the haversine function.
- Hardware-assisted virtualization, also known as Accelerated Virtualization, Hardware Virtual Machine (HVM), or Native Virtualization