| Abbreviation | Definition |
|---|---|
| AA | Achievement Age |
| AAAP | American Association for Applied Psychology |
| AAAP | American Association of Applied Psychology |
| AAP | Association for the Advancement of Psychology |
| AAPB | Association for Applied Psychophysiology and Biofeedback |
| AASI | Abel Assessment for Sexual Interest |
| ABBCP | American Board of Behavioral and Cognitive Psychology |
| ABBP | Acceptance Based Behavioral Therapy |
| ABBP | American Board of Behavioral Psychology |
| ABCP | American Board of Clinical Psychology |
| ABMP | American Board of Medical Psychology |
| ABPP | American Board of Professional Psychology |
| ABPS | American Board of Psychological Specialties |
| ABRP | American Board of Rehabilitation Psychology |
| ABSP | American Board of Sport Psychology |
| ACAP | Asian Congress of Applied Psychology |
| ACCEPT | Association for Community Counselling Education and Psychological Training |
| ACE | Adverse Childhood Experience |
| ACEP | Association For Comprehensive Energy Psychology |
| ACFP | American College of Forensic Psychology |