NMM may refer to:
- FAA Location identifier for Naval Air Station Meridian
- Prefix for Italian ships in the Marina Militare
Organisations
- National Minority Movement, a British organisation which attempted to organise a united front with the existing trade unions
- Navi Mumbai Metro, India
- Nikhil Manipuri Mahasabha, a Hindu nationalist political party
Museums
- National Music Museum, a musical instrument museum in Vermillion, South Dakota
- National Maritime Museum in Greenwich, England
- National Media Museum in Bradford, England
Science and technology
- Nonhydrostatic Mesoscale Model, used by the WRF
- Network-Integrated Multimedia Middleware, a multimedia framework
Chemicals
- N-Methylmorpholine, an organic base in chemistry
- N-methyl mesoporphyrin IX, a hemin-related porphyrin
- N-Methylmaleimide, an organic compound
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