| HNA | Haiku North America 
| Others |
| HNA | Hainan Airlines
| Others |
| HNA | Handelsschiff Normen Ausschuss
| Others |
| HNA | Handicaps Network Africa
| Others |
| HNA | Hardened and Networked Army
| Others |
| HNA | Hardscape North America
| Others |
| HNA | Harker Neumaier Associates
| Others |
| HNA | Harrison Neighborhood Association
| Others |
| HNA | Hawai'i Nurses' Association
| Others |
| HNA | Hawaii Nurses Association
| Others |
| HNA | Hazen's Notch Association
| Others |
| HNA | Health Needs Assessment
| Others |
| HNA | Health Network Architecture
| Others |
| HNA | Health Networks Australia
| Others |
| HNA | Healthcare Networks of America
| Others |
| HNA | Heartland Nannies Agency
| Others |
| HNA | Hellenic Naval Academy
| Others |
| HNA | Heparin Neutralising Activity
| Others |
| HNA | Hereditary Neuralgic Amyotrophy
| Others |
| HNA | Heritage Neighborhood Home
| Others |
| HNA | Heure Normale de l'Atlantique (Atlantic Standard Time)
| Others |
| HNA | Hexitol Nucleic Acid
| Others |
| HNA | Hexitol nucleic acids
| Others |
| HNA | High Nucleic Acid
| Others |
| HNA | Hillingdon Narrowboats Association
| Others |
| HNA | Hilti North America
| Others |
| HNA | Historians of Netherlandish Art
| Others |
| HNA | Hitachi Network Architecture
| Others |
| HNA | Hmong Nationality Archives
| Others |
| HNA | Hob Nob Anyone
| Others |
| HNA | Hockey North America
| Others |
| HNA | Holistic Networkers Association
| Others |
| HNA | Holistic Networkers' Association
| Others |
| HNA | Holy Names Academy
| Others |
| HNA | Honda North America
| Others |
| HNA | Honda North America, Inc.
| Others |
| HNA | Host and Network Association
| Others |
| HNA | Host Nation Agreement
| Others |
| HNA | Host Network Address
| Others |
| HNA | Hot News Alert
| Others |
| HNA | Hottest New Artist
| Others |
| HNA | Howard N. Apsan, Adjunct Professor of Public Affairs
| Others |
| HNA | Human neutrophil antigens
| Others |
| HNA | Human Nuclear Antigen
| Others |
| HNA | Morioka, Japan
| Others |