| Acronym | Definition |
|---|
| COI | Commission de l'Océan Indien (French: Indian Ocean Commission; various nations) |
| COI | Center of Interest (photography) |
| COI | Conflict Of Interest |
| COI | Community of Interest |
| COI | City of Industry (California) |
| COI | Church of India (Columbia, MD) |
| COI | Church of Ireland |
| COI | Certificate of Insurance (insurance) |
| COI | Copy of Insurance |
| COI | Chain of Information |
| COI | Country of Origin Information |
| COI | Control of Infection |
| COI | Certificate of Incorporation |
| COI | Comité Olimpico Internacional (Spanish: International Olympic Committee) |
| COI | Central Office of Information |
| COI | Causes of Infection |
| COI | Compound of Interest |
| COI | Circles of Interest |
| COI | Community of Influence (real estate) |
| COI | Centers of Influence |
| COI | Certificate of Inspection |
| COI | College of Informatics (various universities) |
| COI | Circle of Influence (marketing) |
| COI | Cloak of Invisibility (science fiction) |
| COI | Connersville (Amtrak station code; Connersville, IN) |
| COI | Consiglio Oleicolo Internazionale (Italian: International Olive Oil Council) |
| COI | Competition of Ideas (Ministry of Defense; UK) |
| COI | Chemicals of Interest (US DHS) |
| COI | Current of Injury (cardiology) |
| COI | Committee on Instruction |
| COI | Cytochrome Oxidase I |
| COI | Co-Installer |
| COI | Co-Investigator |
| COI | Commencement of Injection (auto engine) |
| COI | Commission Océanographique Intergouvernementale (French: Intergovernmental Oceanographic Commission; UNESCO) |
| COI | Certified Online Instructor |
| COI | Cost of Illness |
| COI | Court of Inquiry |
| COI | Confirmed Opt-In (email mailing list regiatration confirmation procedure) |
| COI | Center for Open Innovation (University of California, Berkeley) |
| COI | Cost of Insurance |
| COI | Coordinator Of Information |
| COI | Corinne Orbach Immobilier (French real estate company) |
| COI | Cardiac Output Index |
| COI | Complément d'Objet Indirect (French: Indirect Object; grammar) |
| COI | Centre for Organisation and Innovation (Economic and Social Research Council; UK) |
| COI | Course Of Instruction |
| COI | Community Outreach, Inc. (Oregon) |
| COI | Coastal Ocean Institute (Woods Hole Oceanographic Institution) |
| COI | Comando Operativo Interforze (Italian: Operational Interforces Command) |
| COI | Certificate of Irradiation (sterility validation process) |
| COI | Coefficient of Inbreeding |
| COI | Committee on Information |
| COI | Cone of Influence (symbolic model checking procedure) |
| COI | Critical Operational Issue |
| COI | Committee on Infrastructure (India) |
| COI | Composite Optics Inc. |
| COI | Contango Operators, Inc. (Houston, TX) |
| COI | Community Options Inc. |
| COI | Constituents of Interest |
| COI | Certificate of Identicality |
| COI | Consent of Instructor (coursework authorization) |
| COI | Cost of Investment |
| COI | Contact of Interest |
| COI | Current Operating Income (finance) |
| COI | Career Orientation Inventory |
| COI | Cause of Insanity (band) |
| COI | Cut-Off Index (medicine) |
| COI | Canadian Outcomes Institute |
| COI | Criticomm Operating Instructions (telecommuniations) |
| COI | Coloboma of Iris, Choroid, and Retina |
| COI | Country of Interest |
| COI | Crossroads Online Institute |
| COI | Congregation of Israel |
| COI | Chief of Installation |
| COI | Coast Orbital Insertion (NASA) |
| COI | Customer-Owned Inventory |
| COI | Curriculum of Instruction |
| COI | Class Of Interface |
| COI | Commission of Integrity (Iraq) |
| COI | Critical Operations Issues |
| COI | Communications Operating Instruction |
| COI | Chief Of Implementation |
| COI | Chief of Initiatives |
| COI | Current Operations and Intelligence |
| COI | Continuous Optical Irradiation |
| COI | Contractor Operating Instructions |
| COI | Certificate of Installation |
| COI | Coalition of Itan (gaming guild) |