MWI may also refer to:
Science and technology
- Many-worlds interpretation, in quantum mechanics
- Message-waiting indicator, in telephony
- Mobile Web Initiative, in Mobile Web
- Media Wear-Out Indicator, in S.M.A.R.T.
- Ministry of Water and Irrigation, in Water supply and sanitation in Jordan
- Mountain Warfare Instructor, in Mountain Warfare Training Center
- Media Watch International, in Israel on Campus Coalition
- Mad wi' it (mad with it), in Glasgow patter
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