| MCI | (Ontario) Ministry of Citizenship and Immigration 
| Others |
| MCI | Kansas City International Airport, Kansas City, Missouri USA
| Others |
| MCI | Machinery Consultants, Inc.
| Others |
| MCI | Mackenzie Consulting International
| Others |
| MCI | Macroinvertebrate Community Index
| Others |
| MCI | Madina Consultants International
| Others |
| MCI | Maersk Container Industry
| Others |
| MCI | Maggiolino Club Italia
| Others |
| MCI | Maine Central Institute
| Others |
| MCI | Major Capital Improvement
| Others |
| MCI | Major Capital Improvements
| Others |
| MCI | Major Cultural Institutions
| Others |
| MCI | Making Communications Impossible
| Others |
| MCI | Male Contraceptive Initiative
| Others |
| MCI | Malicious Call Identification
| Others |
| MCI | Management Center Innsbruck
| Others |
| MCI | Management Cheats Investors
| Others |
| MCI | Mandibular Cortical Index
| Others |
| MCI | Manually Controlled Infusion
| Others |
| MCI | Many Changes Instantly
| Others |
| MCI | Maples Collegiate Institute
| Others |
| MCI | Marine Corps Institute
| Others |
| MCI | Market Cattle Identification
| Others |
| MCI | Maryland Correctional Institution
| Others |
| MCI | Maserati Classic and International
| Others |
| MCI | Maserati Club International
| Others |
| MCI | Maserati Club Italia
| Others |
| MCI | Mass Casualty Incident
| Others |
| MCI | Mass Casualty Incidents
| Others |
| MCI | Massachusetts Committing Institution
| Others |
| MCI | Massachusetts Correctional Institute
| Others |
| MCI | Massachusetts Correctional Institution
| Others |
| MCI | Massive Corporate Indiscretions
| Others |
| MCI | Master Client Index
| Others |
| MCI | Master CREIA Inspector
| Others |
| MCI | Maximum Circumference Increase
| Others |
| MCI | May Create Insolvency
| Others |
| MCI | Mazda Canada Inc.
| Others |
| MCI | McKenzie Chess Institute, Milpitas, California
| Others |
| MCI | Mclaren Club Indonesia
| Others |
| MCI | Mean Cardiac Index
| Others |
| MCI | Measley Communication Imbeciles
| Others |
| MCI | Measurable Constant Improvement
| Others |
| MCI | Mechanical Contractors Inc
| Others |
| MCI | Media Card Imager
| Others |
| MCI | Media Card Interface
| Others |
| MCI | Media Control Interface
| Others |
| MCI | Media Control Interface Command script
| Others |
| MCI | Medical Clinics Inc
| Others |
| MCI | Medical Council of India
| Regulatory Body, Medical |
| MCI | Melville Cornish Industries
| Others |
| MCI | Meme Comic Indonesia
| Others |
| MCI | Memory Channel Interface
| Others |
| MCI | Mentally Challenged, Inc.
| Others |
| MCI | Message Channel Interface
| Others |
| MCI | Meta Color Information
| Others |
| MCI | Metal Composite Irons
| Others |
| MCI | Mexican Cultural Institute
| Others |
| mCi | Microcuries
| Others |
| MCI | Microsoft Classic Intellimouse
| Others |
| MCI | Microwave Communications Inc.
| Others |
| MCI | Microwave Communications Incorporated
| Others |
| MCI | Microwave Communications, Incorporated
| Others |
| MCI | Mid Continent International
| Others |
| MCI | Mighty Crappy Internet
| Others |
| MCI | Migrating Corrosion Inhibitor
| Others |
| MCI | Mild Cognitive Impairment
| Others |
| MCI | Mild Cognitive Insufficiency
| Others |
| MCI | Military Customs Inspection
| Others |
| MCI | Milk Curds International
| Others |
| MCI | Millicurie
| Others |
| MCI | Mind Control Interface
| Others |
| MCI | Minds Communities Ideas
| Others |
| MCI | Mineral Carbonation International
| Others |
| MCI | Mini Club of Ireland
| Others |
| MCI | Minimalist Contrast Indicator
| Others |
| MCI | Ministry of Citizenship and Immigration
| Others |
| MCI | Mitsubishi Club Israel
| Others |
| MCI | Mitsubishi Club Italia
| Others |
| MCI | Mobile Computer Initiative
| Others |
| MCI | Mobile Computer Injury
| Others |
| MCI | Model Classroom Initiative
| Others |
| MCI | Modeling Clipping Indicator
| Others |
| MCI | Monetary Conditions Index
| Others |
| MCI | Money Coming In
| Others |
| MCI | Monthly Confidence Index
| Others |
| MCI | More Company Indictments
| Others |
| MCI | Morgan Club Italia
| Others |
| MCI | Most Contacts Intermittent
| Others |
| MCI | Mostly Caucasians Intoxicated
| Others |
| MCI | Mostly Crap Inside
| Others |
| MCI | Motion Clarity Index
| Others |
| MCI | Motor Coach Industries
| Others |
| MCI | Motor Controls Inc
| Others |
| MCI | Motor de Combustion Interna
| Others |
| MCI | Movimiento Campesino Independiente
| Others |
| MCI | Mucociliary Clearability Index
| Others |
| MCI | Multi Card Imager
| Others |
| MCI | Multi Channel Integration
| Others |
| MCI | Multi-Casualty Incident
| Others |
| MCI | Multimedia Card Interface
| Others |
| MCI | Multimedia Control Interface
| Others |
| MCI | Multiple Casualty Incident
| Others |
| MCI | Multiple Choice Items
| Others |
| MCI | Multiplicative Competitive Interaction
| Others |
| MCI | Multiport Communication Interface
| Others |
| MCI | Murell Communications Incorporated
| Others |
| MCI | Museum Conservation Institute
| Others |
| MCI | Mustang Club of Indianapolis
| Others |
| MCI | Mutual Capital Instrument
| Others |
| MCI | My Company's Incompetent
| Others |
| MCI | My Creditors Insisted
| Others |
| MCI | My Crotch Itches
| Others |
| MCI | The Managers Club, Incorporated
| Others |