| HCTA | Halpern Critical Thinking Assessment 
| Others |
| HCTA | Harford Community Tennis Association
| Others |
| HCTA | Health Care Technology Assessment
| Others |
| HCTA | Health Care Training Academy
| Others |
| HCTA | Helicopter Composite Technology Application
| Others |
| HCTA | Hernando Classroom Teachers Association
| Others |
| HCTA | High Capacity Transportation Account
| Others |
| HCTA | Hillsborough Classroom Teachers Association
| Others |
| HCTA | Homestead Conservation and Trails Association
| Others |
| HCTA | Hopkinton Contoocook Taxpayers Association
| Others |
| HCTA | Host Country Tax Authority
| Others |
| HCTA | Host County Tax Authority
| Others |