HPA may refer to: Organizations 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 People Hans Peter Anvin (born 1972), Swedish computer programmer Howlin' Pelle Almqvist (Born 1978), Swedish lead singer of garage rock band The Hives Science Hectopascal (hPa), a unit of pressure Human platelet antigen Human Protein Atlas Hydrogen pinch analysis Hypothalamic–pituitary–adrenal axis in physiology Technology 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. Transport Honor Oak Park railway station (National Rail station code), in London, England Lifuka Island Airport, in Tonga Other uses Highland Prince Academy de Mexico, a group of schools in Tijuana