MR

MR, Mr, mr, or mR may refer to:

• Mr. an honorific title of men

Places

• Morocco country code (Library of Congress MARC standards)
• Martinique country code (World Meteorological Organization)
• Mauritania country code (ISO 3166-1 Alpha-2, FIPS 10-4)
  • .mr, the country code top level domain (ccTLD) for Mauritania
• Menntaskólinn í Reykjavík, a secondary school in Iceland

Businesses

• Air Mauritanie (IATA code)
• Master Replicas, a maker of prop replicas
• Metropolitan Railway, a London suburban railway
• Midland Railway, a United Kingdom railway
• Magyar Rádió, a Hungarian radio station

Science

• Mathematical Reviews, journal and database
• Magnetic resonance, as part of a longer initialism (NMR, MRI)
• Magnetoresistance
• Mental retardation
• Mineralocorticoid receptor
• Mitral regurgitation
• Mega rayleigh (unit), MR, a unit of luminous flux
• Milli roentgen (unit), mR, an obsolete unit of radioactive exposure
• Mixed reality

Miscellaneous

• Mr. (artist), a Japanese artist
• Mouvement Réformateur, a Belgian political party
• Marathi language (mr ISO 639-1 code)
• MR (Marina and Rainer) (1989), one-act chamber opera by Nikolai Korndorf
• Rear mid-engine, rear-wheel-drive layout, automotive layout
• Nissan MR engine
• Model Railroader, US magazine
• Mr. (band), Hong Kong rock band
• McCune–Reischauer, a system of romanization of the Korean language

See also

• Mister (disambiguation)