| Acronym | Definition |
|---|
| HSAA➣High School Athletic Association (Plano, TX) |
| HSAA➣Handbook of Space Astronomy and Astrophysics (Cambridge University Press) |
| HSAA➣Health Sciences Association of Alberta (Canada) |
| HSAA➣Hospital Service Accountability Agreement (Canada) |
| HSAA➣Henry Schein Ash Arcona (Canada) |
| HSAA➣High School Alumni Association |
| HSAA➣Homeland Security Appropriations Act of 2004 (US DHS and Executive Office of the President) |