MFI
- MFI (retailer)
- MFI Foundation Inc.
- MFi Program
- Magnetic field imaging
- Media Factory, Inc.
- Melt flow index
- Messiah Foundation International
- Microfinance institution
- Micromechanical Flying Insect
- Mikoyan Project 1.44
- MindFreedom International
- Minimum Fisher information
- Ministers Fellowship International
- Missionary Flights International
- Monetary Financial Institutions
- Money flow index