| HHA | Haas Hall Academy 
| Others |
| HHA | Half-Hardy Annual
| Others |
| HHA | Hamburger Hochbahn Aktiengesellschaft
| Others |
| HHA | Hampstead Hill Academy
| Others |
| HHA | Hand Held Assay
| Others |
| HHA | Hand Held Assistance
| Others |
| HHA | Hanover Hockey Association
| Others |
| HHA | Happy Hackers Alliance
| Others |
| HHA | Happy Home Academy
| Others |
| HHA | Hard House An
| Others |
| HHA | Hardcore Hardware Australia
| Others |
| HHA | Harmonization for Health in Africa
| Others |
| HHA | Hawaii Housing Authority
| Others |
| HHA | Hawker Hunter Aviation
| Others |
| HHA | Health Hazard Appraisal
| Others |
| HHA | Health Hazard Assessment
| Others |
| HHA | Healthy Heart Africa
| Others |
| HHA | Healthy Heels Ambassadors
| Others |
| HHA | Healthy Help Agency
| Others |
| HHA | Heartland Health Alliance
| Others |
| HHA | Heavy Haulage Australia
| Others |
| HHA | Heavy Horse Archer
| Others |
| HHA | Heights Homeowners Assoc
| Others |
| HHA | High Hardness Armor
| Others |
| HHA | High Hazard Area
| Others |
| HHA | Hiliary Haters of America
| Others |
| HHA | Hill Hold Assistant
| Others |
| HHA | Hillary Haters of America
| Others |
| HHA | Historic Harrisburg Association
| Others |
| HHA | Historic Hotels of America
| Others |
| HHA | Historic Houses Assn
| Others |
| HHA | Historic Houses Association
| Others |
| HHA | Home Health Agencies
| Others |
| HHA | Home Health Agency
| Others |
| HHA | Home Health Aid
| Others |
| HHA | Home Health Aid(es)
| Others |
| HHA | Home Health Aide
| Others |
| HHA | Home health aides
| Others |
| HHA | Home Health Aids
| Others |
| HHA | Home Health Assistant
| Others |
| HHA | Homology Homotopy and
| Others |
| HHA | Homology Homotopy and Applications
| Others |
| HHA | Honduran Health Alliance
| Others |
| HHA | Horse Hair Analysis
| Others |
| HHA | Houston Housing Authority
| Others |
| HHA | Html Help Author
| Others |
| HHA | Huang Hua, Mainland China
| Others |
| HHA | Hypogonadotropic Hypogonadism and Anosmia
| Others |
| HHA | Hypothalamus, Hypothesis, and Adrenal
| Others |
| HHA | IEEE Herman Halperin Electric Transmission and Distribution Award
| Others |