HPA

• Harry Potter Alliance, a charity
• Halifax Port Authority, Canada
• Hamburg Port Authority, Germany
• Hawaii Preparatory Academy, a school in Hawaii, US
• Health Protection Agency, UK
• Heerespersonalamt, the German Army Personnel Agency 1920-1944
• Hollywood Post Alliance, an American trade organization
• Houston Peace Academy of the Islamic Education Institute of Texas, US
• Hurlingham Polo Association, UK polo governing body
• HPA Toucan human-powered aircraft built by Hertfordshire Pedal Aeronauts

• Hans Peter Anvin (born 1972), Swedish computer programmer
• Howlin' Pelle Almqvist (Born 1978), Swedish lead singer of garage rock band The Hives

• Hectopascal (hPa), a unit of pressure
• Human platelet antigen
• Human Protein Atlas
• Hydrogen pinch analysis
• Hypothalamic–pituitary–adrenal axis in physiology

• High-performance addressing, in LCD displays
• Host protected area of computer data storage
• Human-powered aircraft
• High-pressure air, in paintball guns
• Horizontal Pod Autoscaling, the Kubernetes autoscaler.

• Honor Oak Park railway station (National Rail station code), in London, England
• Lifuka Island Airport, in Tonga

• Highland Prince Academy de Mexico, a group of schools in Tijuana
• Hydraulic Project Approval, an approval for hydraulic projects granted by the Washington State Department of Fish and Wildlife (WDFW)

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