| Rank | Abbreviation | Meaning |
|---|
| ***** | HAAA | Hypo Auditory Aesthetic Aphasia
| |
| *** | HAAA | Human Anti Animal Antibodies
| |
| * | HAAA | Hellenic Advertising Agencies Association
| |
| * | HAAA | Human Anti Animal Antibody
| |
| * | HAAA | Heritage Area Agency on Aging
| |
| * | HAAA | Hellenic Amateur Astronomy Association
| |
| * | HAAA | Harvard Arab Alumni Association
| |
| * | HAAA | Home Authentication Authorization and Accounting
| |
| * | HAAA | Hepatitis Associated Aplastic Anaemia
| |
| * | HAAA | Hepatitis-Associated Aplastic Anemia
| |
| * | HAAA | Health Access and Affordability Act
| |
| * | HAAA | House Administrative Assistants Association
| |
| * | HAAA | Hopatcong Area Amateur Astronomers
| |
| * | HAAA | Henderson Area Arts Alliance
| |
| * | HAAA | Hegins Area Ambulance Association
| |
| * | HAAA | Halton Aircraft Apprentice Association
| |
| * | HAAA | Hogwarts Alumni Auror Association
| |
| * | HAAA | Holy Angels Athletic Association
| |
| * | HAAA | Has an Anti Administration
| |
| * | HAAA | Honors Academic Achievement Awards
| |
| * | HAAA | human astrocytoma-associated antigen
| |
| * | HAAA | Hospital Administration Alumni Association
| |
| * | HAAA | House Administrative Assistants Alumni
| |
| * | HAAA | Houston Allergy Asthma Associates
| |
| * | HAAA | Halifax Area Advertising Authority
| |