| AAATP | American Academy of Accounting Tax Professionals | |
| AAC | Agile Analysis Certification | |
| AACB | Association of Accredited Certification Bodies | |
| AACO | American Association of Certified Orthoptists | |
| AACP | American Alliance Certified Paralegal | |
| AACP | Administrative Assistant Certificate Program | |
| AAHCPA | American Association of Hispanic Certified Public Accountants | |
| AAMI | Association for the Advancement of Medical Instrumentation | |
| AAPWCA | Associate of the American Professional Wound Care Association | |
| AAS | Associate of Applied Science in Nursing | |
| AASC | Annual Audit Status Certification | |
| ABC | American Board for Certification | |
| ABCB | Association of British Certification Bodies | |
| ABCP | Accredited Business Continuity Professional | |
| ABD | Advanced Biodynamic Diploma | |
| ABOC | American Board of Opticianry Certification | |
| ABOC | American Board of Opticianry Certified | |
| ACA | Allstates Certificate Advantage | |
| ACA | Adobe Certified Associate | |
| ACAAB | Associate Certificate Applied Animal Behaviorist | |
| ACAF | Advanced Certificate in Accounting and Finance | |
| ACAF | Advanced Certificate in Accounting Finance | |
| ACAMS | Association of Certified Anti Money-laundering Specialists | |
| ACAP | Associate Certified Analytics Professional | |
| ACB | American Certification Body | |
