| Acronym | Definition |
|---|
| MCO➣Managed Care Organization |
| MCO➣Monaco (ISO Country code) |
| MCO➣Marine Corps Order |
| MCO➣Médecine Chirurgie Obstétrique (French: Medicine Surgery Obstetrics) |
| MCO➣Manchester Oxford Road (railway station; UK) |
| MCO➣Medical College of Ohio (Toledo, OH, USA) |
| MCO➣Manufacturing Connection Online |
| MCO➣Microcontroller Clock Output |
| MCO➣Mars Climate Orbiter |
| MCO➣Manufacturer's Certificate of Origin |
| MCO➣Major Combat Operations |
| MCO➣Motor City Online (game) |
| MCO➣Multi-Country Organization (various locations) |
| MCO➣Miscellaneous Charge Order (airline industry financial term) |
| MCO➣Modern Chess Openings |
| MCO➣Marketing Communication Office (Philippines) |
| MCO➣Miscellaneous Charges Order |
| MCO➣Minister for the Cabinet Office (UK) |
| MCO➣Mission Critical Occupation (various government agencies) |
| MCO➣Master Control Operator |
| MCO➣Michigan College of Optometry (Ferris State University; Big Rapids, MI) |
| MCO➣Micro Credit Organization (various locations) |
| MCO➣Military Claims Office |
| MCO➣Midwest Christian Outreach, Inc. (Wonder Lake, IL) |
| MCO➣Multi-Canister Overpack |
| MCO➣Movement Control Officer |
| MCO➣Material Control Officer |
| MCO➣Machinery Checkout |
| MCO➣Maintenance Changeout |
| MCO➣Orlando, FL, USA - Orlando International Airport (Airport Code) |
| MCO➣Middle Cornish (linguistics) |
| MCO➣Mechanical Control Outline |
| MCO➣Management Control Officer |
| MCO➣Manila Chamber Orchestra |
| MCO➣Maximum Cumulative Outflow (finance) |
| MCO➣Merchandise Coordinator |
| MCO➣Mobile Cellular Operator |
| MCO➣Manufacturing Change Order |
| MCO➣Minnesota Citizens Online |
| MCO➣Missile Control Officer |
| MCO➣Melbourne Community Orchestra (Melbourne, FL) |
| MCO➣Manual Changeover Signal (ITU-T) |
| MCO➣Major Contingency Operation (US Army) |
| MCO➣Music Company Orchestra (Saratoga Springs, NY) |
| MCO➣Military Corporation Office |
| MCO➣Motor Sport Club of Ottawa |
| MCO➣Metropolitan Chamber Orchestra (Columbus, OH) |
| MCO➣Maintenance Criticality Oriented |
| MCO➣Maneuver Control Officer |
| MCO➣Motor Carrier Office |
| MCO➣Meat Control Officers |
| MCO➣Markov Chain Occupancy |
| MCO➣Multi-Collaborative Overlay |
| MCO➣Mobile Country Operator |
| MCO➣Movements Control Office/Officer |
| MCO➣Music Comedy Opera (Newberg, OR) |
| MCO➣Major Cultural Organization |
| MCO➣Mogogelo Community Outreach (Mogogelo, South Africa) |
| MCO➣Metropolitan Civic Orchestra (Charleston, SC) |