COA
- Addiction
- Alcoholism
- Andorran Olympic Committee
- Argentine Olympic Committee
- Aruban Olympic Committee
- Canadian Osteopathic Association
- Care-of address
- Certificate of authenticity
- Chart of accounts
- Charter Ownership Agreement
- Chicago Options Associates
- Ciphertext-only attack
- Clowns of America International
- Coa (disambiguation)
- Coahuila
- Coarctation of the aorta
- Coat of arms
- Coenzyme A
- Collaboration-oriented architecture
- College of Alameda
- College of The Albemarle
- College of the Atlantic
- Commission on Audit (Philippines)
- Committee of Administrators (CoA)
- Community Oncology Alliance
- Condominiums in Canada
- Continental Airlines
- Council of Agriculture
- Council of Architecture
- Court of Appeal (England and Wales)
- Customs Officers' Association of New Zealand
- Drug reference standard
- Federal Aviation Administration
- Joint Commission on Allied Health Personnel in Ophthalmology
- Military Decision Making Process
- NACoA
- National Association for Children of Alcoholics
- RADIUS
- Square knot insignia