| Abbreviations | Meaning |
 | ACN | Association For Comprehensive NeuroTherapy |
| ACN | Association Of Camp Nurses |
| ACN | Australian Cancer Network |
| ACNEM | Australasian College Of Nutritional & Environmental Medicine |
| ACNM | American College Of Nuclear Medicine |
| ACNM | American College Of Nurse-Midwives |
| ACNN | Association Of Child Neurology Nurses |
| ACNP | American College Of Neuropsychiatrists |
| ACNP | American College Of Neuropsychopharmacology |
| ACNP | American College Of Nuclear Physicians |
| ACNP | American College Of Nurse Practitioners |
| ACNU / UNAC | Association Canadienne Pour Les Nations Unies / United Nations Association In Canada |
| ACO / ASSO | Arbeitsgemeinschaft Für Chirurgische Onkologie Der Österreichischen Gesellschaft Für Chirurgie / Austrian Society Of Surgical Oncology |
| ACO / CAO | Association Canadienne Des Optométristes / Canadian Association Of Optometrists |
| ACO / CAO | Association Canadienne Des Orthodontistes / Canadian Association Of Orthodontists |
| ACO / COA | Association Canadienne D'Orthopédie / Canadian Orthopaedic Association |
| ACOA / CASLPA | Association Canadienne Des Orthophonistes Et Audiologistes / Canadian Association Of Speech-Language Pathologists And Audiologists |
| ACOCA | AIDS Council Of Central Australia |
| ACOEM | American College Of Occupational And Environmental Medicine |
| ACOEP | American College Of Osteopathic Emergency Physicians |
| ACOFP | American College Of Osteopathic Family Physicians |
| ACOG | American College Of Obstetricians And Gynecologists |
| ACOHM | Australian College Of Herbal Medicine |
| ACOM / CAMO | Association Canadienne Des Oncologues Médicaux / Canadian Association Of Medical Oncologists |
| ACOMS | American College Of Oral And Maxillofacial Surgeons |
| ACON | AIDS Council Of New South Wales |
| ACOOG | American College Of Osteopathic Obstetricians And Gynecologists |
| ACOP / CAPO | Association Canadienne D'Oncologie Psychosociale / Canadian Association Of Psychosocial Oncology |
| ACOPHRA | Association Consultative Et Promotionnelle Des Pharmaciens Hospitaliers De La Région Rhône-Alpes |
| ACOPSA | American College Of Psychoanalysts |
| ACOR | Association Of Cancer Online Resources |
| ACOSOG | American College Of Surgeons Oncology Group |
| ACOSS | Agence Centrale Des Organismes De Sécurité Sociale |
| ACOSS | Australian Council Of Social Service |
| ACP | Alliance Of Cardiovascular Professionals |
| ACP | American College Of Phlebology |
| ACP | American College Of Physicians |
| ACP | American College Of Prosthodontists |
| ACP | American College Of Psychiatrists |
| ACP | Analytical Cellular Pathology [periodical] |
| ACP | Association For Child Psychoanalysis |
| ACP / CAP | Académie Canadienne De Parodontologie / Canadian Academy Of Periodontology |
| ACP / CAP | Association Canadienne Des Pathologistes / Canadian Association Of Pathologists |
| ACP / CPA | Association Canadienne Des Paraplégiques / Canadian Paraplegic Association |
| ACPA | American Chronic Pain Association |
| ACPA | American Cleft Palate-Craniofacial Association |
| ACPA | Australian Cerebral Palsy Association |
| ACPE | American College Of Physician Executives |
| ACPE | Accreditation Council For Pharmacy Education |
| ACPGBI | Assocation Of Coloproctology Of Great Britain And Ireland |
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