HAV or hav may refer to:

• Hallux abducto valgus, or bunion
• Hand arm vibrations
• Hardware-assisted virtualization
• Havant railway station, in England
• Havant RFC, an English rugby union club
• Haversine function
• Havildar, a rank in the Indian and Pakistani armies
• Havre (Amtrak station), in Montana, United States
• Havu language, spoken in the Democratic Republic of the Congo
• Hepatitis A virus
• Highly Automated Vehicle, a term for Autonomous car but also includes vehicles with Advanced driver-assistance systems features
• Hindu Aikya Vedi, a Hindu organization
• Hybrid Air Vehicles, a British manufacturer
• José Martí International Airport in Havana, Cuba
• Lifting stone, called hav in the Faroe Islands
• Hav, a fictional location in the novel Last Letters from Hav by Jan Morris
• Hav., the author abbreviation for Norwegian botanist Johan Havaas