NMM

NMM may refer to:


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