MMR may refer to:
Science and technology MMR vaccine, for measles, mumps and rubella DNA mismatch repair, a genetic repair pathway Mass miniature radiography, a tuberculosis screening technique Maternal mortality ratio Maternal mortality rate Mean-motion resonance, between two orbiting bodies Mesozoic Marine Revolution, a burst of evolution Micro modular reactor, a subcategory of Small Modular Reactors, much smaller in scale than traditional nuclear reactors
Computing Meet-me room, where telecoms companies can communicate Modified Modified READ, Group 4 compression Matchmaking rating, in video games
Places Myanmar (ISO 3166-1 alpha-3 and UNDP country code) Mumbai Metropolitan Region, India Manmad Junction railway station (station code: MMR), Maharashtra, India
Other uses Marine Mammal Regulations, of Canada Master of Marketing Research, a business degree Abbreviation formerly used for Melbourne Metro Rail, now known as the Metro Tunnel Middle Gorge railway station, Melbourne