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<!-- Intentional duplicate allowed by MOS:DP -->

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<sub>r</sub>

Transport

  • M.R. (automobile), a microcar model built in 1945
  • Air Mauritanie (by IATA code) <!-- Intentional duplicate allowed by MOS:DP -->
  • Midland Railway, a United Kingdom railway
  • Nissan MR engine
  • Rear mid-engine, rear-wheel-drive layout, an automotive layout
  • Mary (vehicle registration suffix MR)

See also

  • Magnetic resonance (disambiguation)
  • McCune–Reischauer, a romanization system for the Korean language
  • Mister (disambiguation)