| Abbreviation | Definition |
|---|---|
| MFQS | Mutual Fund Quotation Service |
| MFR | Maria Fiorini Ramirez, Inc. |
| MFR | Mir, Fox, & Rodriguez, P. C. |
| MFR | Morton Fraser Relocation |
| MFS | Massachusetts Financial Services |
| MFS | Mazzei Flying Service |
| MFS | Metropolitan Fiber Services |
| MFS | Metropolitan Fiber Systems |
| MFS | Moorabbin Flying Services |
| MFSA | Mailing and Fulfillment Service Association |
| MFSB | Mannheim San Francisco Bay |
| MG | Marvel Graphics |
| MG | MaschinenGewehr |
| MG | Medical Group |
| MG | Memphis Group |
| MG | Mirisah Games |
| MG | Morris Garages |
| MG | Music Group |
| MG | Musical Group |
| MGAC | Metal and Gemstone Acquisition Company |