HIA
- America's Health Insurance Plans
- Hamad International Airport
- Hampton-in-Arden railway station
- Harrisburg International Airport
- Hauppauge Industrial Association
- Health Initiative of the Americas
- Health impact assessment
- Hemp Industries Association
- Hendrik-Ido-Ambacht
- Herzberg Institute of Astrophysics
- Hia (magazine)
- Higher Intelligence Agency
- Highlands and Islands Alliance
- Hoonah Indian Association
- Housing Industry Association
- Huai'an Lianshui Airport
- Lamang language
- Northern Ireland Historical Institutional Abuse Inquiry