| Abbreviation | Definition |
|---|---|
| MCE | Mid Columbia Engineering, Incorporated |
| MCE | Mini Computer Exchange |
| MCEC | Motor City Electro Company |
| MCET | Massachusetts Corporation for Educational Telecommunications |
| MCF | Municipal Corporation Faridabad |
| MCFA | Mitsubishi Corporation Foundation for the Americas |
| MCFC | Montana Community Finance Corporation |
| MCFI | Massachusetts Convention Fandom, Inc |
| MCG | Midwest Consulting Group |
| MCG | Multi Company Group |
| MCHC | Mountain Comprehensive Health Corporation |
| MCHT | Mountainlands Community Housing Trust |
| MCI | Machinery Consultants, Inc. |
| MCI | Mackenzie Consulting International |
| MCI | Madina Consultants International |
| MCI | Medical Clinics Inc |
| MCI | Melville Cornish Industries |
| MCI | Microwave Communications Incorporated |
| MCI | Mid Continent International |
| MCI | Motor Controls Inc |