| HPA | Ha'apai, Tonga Islands, South Pacific 
| Others |
| HPA | HaemangioPericytomA
| Others |
| HPA | Hamburg Port Authority
| Others |
| HPA | Happily Performing Autos
| Others |
| HPA | Haraden Pratt Award
| Others |
| HPA | Harry Potter Alliance
| Others |
| HPA | Hartshorne Plunkard Architecture
| Others |
| HPA | Hawaii Paroling Authority
| Others |
| HPA | Hawaii Preparatory Academy
| Others |
| HPA | Head of Processing Activity
| Others |
| HPA | Head of Procurement Activity
| Others |
| HPA | Health Plan Accreditation
| Others |
| HPA | Health Plan Administrator
| Others |
| HPA | Health Plan Advisories
| Others |
| HPA | Health Policy and Administration
| Others |
| HPA | Health Poverty Action
| Others |
| HPA | Health Professions Academy
| Others |
| HPA | Health Professions Advising
| Others |
| HPA | Health Professions Authority
| Others |
| HPA | Health Promotion Administration
| Others |
| HPA | Health Promotion Advisor
| Others |
| HPA | Health promotion agency
| Others |
| HPA | Health Protection Agency
| Others |
| HPA | Health Protection Agency (BRITISH)
| Others |
| HPA | Health Protection Agency (UK)
| Others |
| HPA | Healthcare Professional Agency
| Others |
| hPa | Hectopascal
| Others |
| HPA | Helping people achieve
| Others |
| HPA | Hereford Pale Ale
| Others |
| HPA | Heritage Preservation Association
| Others |
| HPA | Hide Powder Azure
| Others |
| HPA | Hidrocarburi Policiclice Aromatice
| Others |
| HPA | High Performance Addressing
| Others |
| HPA | High Performance Alloy
| Others |
| HPA | High Performance Aluminium
| Others |
| HPA | High Performance Analog
| Others |
| HPA | High Performance Architecture
| Others |
| HPA | High Performance Array
| Others |
| HPA | High Power Amplifier
| Others |
| HPA | High Pressure Air
| Others |
| HPA | High Pressure Awesome
| Others |
| HPA | High Priority Access
| Others |
| HPA | High Priority Area
| Others |
| HPA | High Purity Alumina
| Others |
| HPA | High-Power Amplifier
| Others |
| HPA | High-Purity Aluminium
| Others |
| HPA | Highly Professional Advisors
| Others |
| HPA | His-Purkinje activity
| Others |
| HPA | Hollywood Post Alliance
| Others |
| HPA | Hollywood Professional Association
| Others |
| HPA | Home Price Appreciation
| Others |
| HPA | Homeowners Protection Act
| Others |
| HPA | Homeplug Powerline Alliance
| Others |
| HPA | Homeschool Performing Arts
| Others |
| HPA | Honda Personal Assistant
| Others |
| HPA | Honors Point Average
| Others |
| HPA | Hop Products Australia
| Others |
| HPA | Horizontal Pod Autoscaler
| Others |
| HPA | Horizontal Pod Autoscaling
| Others |
| HPA | Horizontal Position Absolute
| Others |
| HPA | Horticulture Produce Agreement
| Others |
| HPA | Horticulture Produce Agreements
| Others |
| HPA | Host Protected Area
| Others |
| HPA | Houston Paralegal Association
| Others |
| HPA | Human Platelet Antigen
| Others |
| HPA | Human Platelet Antigens
| Others |
| HPA | Human Powered Aircraft
| Others |
| HPA | Human Protein Atlas
| Others |
| HPA | Humanity Photo Awards
| Others |
| HPA | Hurlingham Polo Association
| Others |
| HPA | Hydraulic Project Approval
| Others |
| HPA | Hydrocephalic Procarbazine Acetate
| Others |
| HPA | hyperphenylalaninaemia
| Others |
| HPA | Hypertrophic Pulmonary Arthropathy
| Others |
| HPA | Hypothalamic - Pituitary - Adrenal (axis)
| Others |
| HPA | Hypothalamic Pituitary Adrenal
| Others |
| HPA | Hypothalamic Pituitary Axis
| Others |
| HPA | Hypothalamic-Pituitary-Adrenal
| Others |
| HPA | Hypothalamo Pituitary Adrenal
| Others |
| HPA | Hypothalamus Pituitary Adrenal
| Others |
| HPA | Hypothalamus Pituitary and Adrenal
| Others |
| HPA | hypothalmic-pituitary-adrenal axis
| Others |
| HPA | Hypothamic Pituitary Adrenal
| Others |
| HPA | IEEE Haraden Pratt Award
| Others |