| Abbreviation | Definition |
|---|---|
| AAAP | Alabama Autism Assistance Program |
| AACT | Autism Awareness Care and Training |
| AAD | Autoimmune Autistic Disorder |
| AADI | Autism Awareness Dogs Ireland |
| AAEC | Approved Autism Evaluation Centers |
| AALG | Action Autism League Go |
| AANE | Asperger / Autism Network |
| AAOM | Autism Alliance of Michigan |
| AARC | Alaska Autism Resource Center |
| AARG | Adult Autism Resource Group |
| AARTS | Autism Assessment Research Treatment and Services |
| AARTS | Autism Assessment Research Treatment Services |
| AASS | Autism Advisory and Support Service |
| AAW | Adult Autism Waiver |
| ABA | Autism and Behavior Analysis |
| ABATS | Autism Believe Accept Therapy Services |
| ABCD | Autism Behavior and Child Development |
| ABH | Autism Behavioral Health |
| ABIDE | Autism Brain Imaging Data Exchange |
| ACAP | Autistic Children's Activity Program |