| Acronym | Definition |
|---|
| MFI | Money Flow Index |
| MFI | Microfinance Institution |
| MFI | Median Family Income |
| MFI | Melt Flow Index |
| MFI | MindFreedom International (human rights in mental health.) |
| MFI | Multisensor Fusion and Integration for Intelligent Systems (International Conference) |
| MFI | Malaria Foundation International |
| MFI | Mean Fluorescent Intensity (biology) |
| MFI | Monetary Financial Institution (United Kingdom Economic Accounts) |
| MFI | Multi-port Fuel Injection (automobile) |
| MFI | Massachusetts Family Institute |
| MFI | Malaysia France Institute (Malaysia) |
| MFI | Mechanical Fuel Injection (automobile) |
| MFI | Modèles Formels de l'Interaction |
| MFI | Micro Flow Imaging (cell and particle analysis) |
| MFI | Micromechanical Flying Insect |
| MFI | Metamodel Framework for Interoperability (web registration) |
| MFI | Mullard Furniture Industries (UK) |
| MFI | Made for Idiots |
| MFI | Multi-Function Interpreter |
| MFI | Magnetic Field Instrument |
| MFI | Maquis Forces International (Star Trek organization) |
| MFI | Median Fluorescence Intensity (flow cytometry) |
| MFI | Magnetic Field Imaging |
| MFi | Melody Format for I-Mode (musical format) |
| MFI | Multilateral Funding International |
| MFI | Money Fund Intelligence |
| MFI | Marine Fenders International, Inc. (Wilmington, CA) |
| MFI | MegaRAID Firmware Interface (driver) |
| MFI | Main Frame Interactive |
| MFI | Moderately Food Insecure |
| MFI | Master Flight Instructor |
| MFI | Multi-Frame Integration |
| MFI | Marine Firefighting Institute |
| MFI | Military Food Inspector (synonymous with AVI) |
| MFI | Montanans for Impeachment |
| MFI | Major Force Issue |
| MFI | Monitor Fault Isolation |
| MFI | Measurement for Innovators (Department for Business, Innovation and Skills; UK) |
| MFI | Mordenite Framework Inverted (zeolites) |
| MFI | Male Factor Infertility |
| MFI | Management of Financial Institutions (various universities) |
| MFI | Main Financial Institution (banking) |