Organizations
- Marching Illini, the marching band at the University of Illinois
- Mechanics Institute
- Monumental Inscription
- Mood Indigo, an annual cultural festival of IIT Bombay
- Mumbai Indians, an Indian Premier League team
- Militia Immaculata, a worldwide evangelization movement
- Millennia Institute, a pre-university institution in Singapore
- Musician's Institute, an institution for higher education in California in the United States
- Mil Moscow Helicopter Plant, a Russian design bureau
- Micronutrient Initiative, an international not-for-profit agency based in Canada
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