HPA
- Autoscaling
- HPA Toucan
- Halifax Port Authority
- Hamburg Port Authority
- Hans Peter Anvin
- Harry Potter Alliance
- Hawaii Preparatory Academy
- Health Protection Agency
- Hectopascal
- Heerespersonalamt
- High-performance addressing
- High-pressure air
- Highland Prince Academy de Mexico
- Hollywood Post Alliance
- Honor Oak Park railway station
- Host protected area
- Howlin' Pelle Almqvist
- Human Protein Atlas
- Human platelet antigen
- Human-powered aircraft
- Hurlingham Polo Association
- Hydrogen pinch analysis
- Hypothalamic–pituitary–adrenal axis
- Islamic Education Institute of Texas
- Lifuka Island Airport