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
• Mr. (band), a Hong Kong pop-rock band
• 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 (Reformist Movement), 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
• Merge request in software development
• Millirem, a unit of radiation dose
• Molecular replacement, a method of solving the phase problem in X-ray crystallography
• Relative molecular mass, mass of a given molecule, M_r

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

See also

• Magnetic resonance (disambiguation)
• Mister (disambiguation)