HPAA
HPAA commonly denotes the Huron‑Perth Athletic Association, a regional sports league, while the acronym also appears in community groups such as allotment associations, health promotion alumni networks, and pyrotechnic arts societies.
Medical
Miscellaneous
Highlands Preservation Area Approval
Hypothalamo Pituitary Adrenal Axis
Helicobacter pylori adhesin A
Community
Hatfield Peverel Allotment Association
Heartland Pyrotechnic Arts Association
Highland Park High School Alumni Association
Hyde Park Art Association