| HASA | Hamline African Student Association 
| Others |
| HASA | Hand-held Audio Spectrum Analyzer
| Others |
| HASA | Harambee After School Academy
| Others |
| HASA | Harnett Area Shag Association
| Others |
| HASA | Harrisburg Abraxas Student Academy
| Others |
| HASA | Hawaii Amateur Surfing Association
| Others |
| HASA | Health Administration Student Association
| Others |
| HASA | Healthcare Access San Antonio
| Others |
| HASA | Hearing and Speech Agency
| Others |
| HASA | Henneth Annun Story Archive
| Others |
| HASA | High Altitude SIGINT Architecture
| Others |
| HASA | High Altitude Southern Appalachian
| Others |
| HASA | Highly Accelerated Stress Audit
| Others |
| HASA | Hispanic American Student Association
| Others |
| HASA | Hitachi Amateur Sports Association
| Others |
| HASA | Hitachi Automotive Systems Americas
| Others |
| HASA | HIV AIDS Services Administration
| Others |
| HASA | HIV/AIDS Services Administration
| Others |
| HASA | Hmong American Student Association
| Others |
| HASA | Home and School Association
| Others |
| HASA | Hope Australia Soccer Academy
| Others |
| HASA | Hopkins Association for Stroke Awareness
| Others |
| HASA | Houston Association of School Administrators
| Others |
| HASA | Hudson Area Swim Association
| Others |
| HASA | Humboldt Area Saltwater Anglers
| Others |
| HASA | Hyundai Automotive South Africa
| Others |