MWI
MWI stands for:
- Message waiting indicator , performance feature of ISDN and system telephone systems
- Many Worlds Interpretation , in German Many Worlds Interpretation , a paradigm for understanding quantum mechanics
- Missionary Institute Missio , an institute for the promotion of science, research and teaching in Catholic missionary work and in the universal church context
- Malawi (Country Code)
- Malawi Airlines (ICAO code), Malawian airline
mwi stands for:
- Ninde (ISO-639-3 code), oceanic language on Malakula , Vanuatu