Organizations
- 3M Corporation (NYSE: MMM), an American manufacturing conglomerate, originally Minnesota Mining and Manufacturing Company
- MMM (Ponzi scheme), a Russian company, active from 1989 to 1994, best known for perpetrating a large financial Ponzi scheme
- Magnificat Meal Movement, a Catholic break-away group in Queensland, Australia
- Mauritian Militant Movement, a Mauritian political party
- Medical Missionaries of Mary, Christian religious order founded by Mother Mary Martin
- Messner Mountain Museum
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