MR
MR, Mr, mr, or mR may refer to:
- Mr., an honorific title before any man's name
Arts, entertainment, and media
- MR (Marina and Rainer), a 1989, one-act, multilingual opera libretto by Nikolai Korndorf
- Magyar Rádió, a Hungarian radio station
- Mixed reality, the merging of real and virtual worlds in digital visualisation
- Model Railroader, an American hobby magazine
- Meta Runner, an Australian web series
Businesses and organisations
- Chief Maqoma Regiment, an infantry regiment of the South African Army
- Mineral Resources, Australian mining company
- Mouvement Radical (Radical Movement), a French political party
- Mouvement Réformateur, a Belgian political party
- Martin Research, a defunct American computer company
Education
- mr., an academic degree, equivalent to Master of Laws, meester in de rechten, in Belgium and the Netherlands
- Menntaskólinn í Reykjavík, a junior college in Iceland
Identification codes
- Air Mauritanie (by IATA code)
- Marathi language (by ISO 639-1)
- Martinique (World Meteorological Organization country code)
- Mauritania (ISO 3166-1 alpha-2 and FIPS 10-4 country codes)
- .mr, the top-level Internet domain for Mauritania
- Morocco (Library of Congress MARC country code)
Law
- Master of the Rolls, the President of the Court of Appeal of England and Wales, Civil Division, and Head of Civil Justice
- mr., an academic degree, equivalent to Master of Laws, meester in de rechten, in Belgium and the Netherlands
Medicine
- Magnetic resonance imaging
- Mental retardation, generalised learning or intellectual disability, in now obsolete jargon
- Mineralocorticoid receptor, a human protein
- Mitral regurgitation of blood flow in the heart
- Modified release
Science
- Magnetoresistance, change in electrical resistance due to a magnetic field
- Mendelian randomization, a way of using genetic information to estimate causal effects
- Millirem, a unit of radiation dose
- Relative molecular mass, mass of a given molecule, Mr
Transport
- M.R. (automobile), a microcar model built in 1945
- Air Mauritanie (by IATA code)
- Midland Railway, a United Kingdom railway
- Nissan MR engine
- Rear mid-engine, rear-wheel-drive layout, an automotive layout
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