Organizations
- Halifax Port Authority, a port authority in Canada
- Hamburg Port Authority, the port authority for the Port of Hamburg, Germany
- Health Protection Agency, a health organization in the United Kingdom
- Hurlingham Polo Association, the governing body for polo in the UK
- Hawaii Paragliding Association, a local chapter of the United States Hang Gliding and Paragliding Association on O'ahu in Hawaii, USA
- Harry Potter Alliance, an organisation based around the Harry Potter fandom designed to raise funds towards charitable causes through campaigns and events related to the series.
Read more about this topic: HPA