The abbreviation MDI
- Management Development Institute, a school in Gambia
- Maxwell -Dirac isomorphism, established in 1978 by Hans H. Sallhofer
- Medium Dependent Interface, a physical and mechanical interface to a transceiver unit
- Metered Dose Inhaler, the English name for MDIs containing propellants, see aerosol
- Methylene diphenyl diisocyanate, a raw material for polyurethane applications (eg, insulating foams, PU foam ( = assembly adhesives ) ) - see diphenylmethane
- Micro Design International, a company that specializes in products with NAS technology.
- Michelson Doppler Imager, a project at the Stanford - Lockheed Institute for Space Research.
- Motor Development International, a co-developer of compressed air cars.
- Moving dial indicator, a device for radio navigation, see Radio Compass
- Multiple Document Interface, in computing, a special design of the form of graphical user interfaces
The abbreviation mDI
- Ministry of the Interior of the GDR
- Master of the island, a cycle of science fiction series Perry Rhodan
The acronym refers to mdi
- The journal Forum for Medicine documentation and medical computer science, see mdi ( eMagazine)
- In the data processing, the file extension *. mdi for the file format Microsoft Document Imaging Format, see Microsoft Office Document Imaging
- For the file format Multimedia Database Information System, an object-oriented exchange format for software in the construction industry