| Acronym | Definition |
|---|
| COI | Conflict Of Interest |
| COI | Community Of Interest |
| COI | Comité Olimpico Internacional (Spanish: International Olympic Committee) |
| COI | Central Office of Information |
| COI | Country of Origin Information |
| COI | Cytochrome Oxidase I |
| COI | Commission de l'Océan Indien |
| COI | Commission Océanographique Intergouvernementale (French: Intergovernmental Oceanographic Commission; UNESCO) |
| COI | Cost of Illness |
| COI | Confirmed Opt-In (email mailing list regiatration confirmation procedure) |
| COI | Certificate of Inspection |
| COI | Co-Investigator |
| COI | Commission de l'Océan Indien (Indian Ocean Commission) |
| COI | Certificate Of Insurance (insurance) |
| COI | Cost of Insurance |
| COI | Committee on Information |
| COI | Coordinator Of Information |
| COI | Church Of Ireland |
| COI | Centers of Influence |
| COI | Coefficient of Inbreeding |
| COI | Course Of Instruction |
| COI | Critical Operational Issue |
| COI | Court of Inquiry |
| COI | Cone of Influence (symbolic model checking procedure) |
| COI | Composite Optics Inc. |
| COI | Certified Online Instructor |
| COI | Circle of Influence (marketing) |
| COI | Committee on Infrastructure (India) |
| COI | Community Options Inc. |
| COI | Contact of Interest |
| COI | Constituents of Interest |
| COI | Cause of Insanity (band) |
| COI | Career Orientation Inventory |
| COI | Coastal Ocean Institute (Woods Hole Oceanographic Institution) |
| COI | Cut-Off Index (medicine) |
| COI | Country of Interest |
| COI | Canadian Outcomes Institute |
| COI | Coloboma of Iris, Choroid, and Retina |
| COI | Church of India (Columbia, MD) |
| COI | Causes of Infection |
| COI | Crossroads Online Institute |
| COI | Chief of Installation |
| COI | Coast Orbital Insertion (NASA) |
| COI | Circles Of Interest |
| COI | Commencement of Injection (auto engine) |
| COI | Chain of Information |
| COI | Curriculum of Instruction |
| COI | Commission of Integrity (Iraq) |
| COI | Critical Operations Issues |
| COI | Class Of Interface |
| COI | Certificate Of Identicality |
| COI | Chief Of Implementation |
| COI | Chief of Initiatives |
| COI | Communications Operating Instruction |
| COI | Current Operations and Intelligence |
| COI | Contractor Operating Instructions |
| COI | Continuous Optical Irradiation |
| COI | Coalition of Itan (gaming guild) |