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 Gymnasium 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, 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 Mary (vehicle registration suffix MR)
See also Magnetic resonance (disambiguation) McCune–Reischauer, a romanization system for the Korean language Mister (disambiguation) Multirole combat aircraft, aircraft intended to perform different roles in combat