| Abbreviation | Definition |
|---|---|
| ARAP | Alliance for Responsible Atmospheric Policy |
| ARCH | Alliance for the Restoration of Cultural Heritage |
| ARCS | Alliance for Research on Corporate Sustainability |
| ARE | Alliance for Rural Electrification |
| AREA | Augmented Reality Enterprise Alliance |
| ARENA | ASEAN Real Estate Network Alliance |
| ARGA | Alliance for Rebuilding Governance in Africa |
| ARH | Alliance of Registered Homeopaths |
| ARISE | Alliance to Reward Initiatives and Social Enterprise |
| AROS | Alliance to Reclaim Our Schools |
| ASA | Amphibian Survival Alliance |
| ASAC | Alliance for the Study of Adoption and Culture |
| ASAP | Alliance in Support of the Afghan People |
| ASAP | American Syringomyelia Alliance Project |
| ASAP | Animal Shelter Alliance of Portland |
| ASAPP | Alliance for Stroke Awareness and Prevention Project |
| ASATA | Alliance of South Asians Taking Action |
| ASBM | Alliance for Safe Biologic Medicines |
| ASBP | Alliance for Sustainable Building Products |
| ASCK | Alliance of Scholars Concerned about Korea |