| Acronym | Definition |
|---|
| HHA | Hawker Hunter Aviation (jet contractor; UK) |
| HHA | Home Health Agency |
| HHA | Home Health Aide |
| HHA | Hip Hop Abs (exercise) |
| HHA | Historic Houses Association (London, UK) |
| HHA | Houston Housing Authority (Houston, TX) |
| HHA | Homology, Homotopy and Applications |
| HHA | Holly Hill Academy (Holly Hill, SC) |
| HHA | Harmonization for Health in Africa |
| HHA | Health Hazard Assessment |
| HHA | Highland Housing Alliance (UK) |
| HHA | Hate Hurts America (interfaith coalition) |
| HHA | High Hazard Area |
| HHA | Hand Held Assistance |
| HHA | Highland Housing Association (Scotland, UK) |
| HHA | Hand Held Assays |
| HHA | Hip Hop Alliance (Skidmore College; Saratoga Springs, NY) |
| HHA | Hamburger Hochbahn Aktiengesellschaft |
| HHA | Hawai'i Homeschool Association |
| HHA | Hyde Housing Association (UK) |
| HHA | Headwaters Health Authority |
| HHA | Hypogonadotropic Hypogonadism and Anosmia |
| HHA | Hard Hat Area |
| HHA | High Hard Armor |
| HHA | Hungarian Horse Association |
| HHA | Happy Hackers Alliance |
| HHA | Hypoestrogenic Hypothalamic Amenorrhea |
| HHA | Health, Human Services, and Aging Committee (Ohio) |