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 Mauritania (IATA code)
• MacRumors.com
• Master Replicas, a maker of prop replicas
• Midland Railway
• Magyar Rádió, a Hungarian radio station

Science:

• Mathematical Reviews, a database of reviews of mathematics publications
• Magnetic resonance (MR)
• Magnetoresistance
• Mental retardation, a developmental disorder
• Mineralocorticoid receptor
• Mitral regurgitation, leaking of the mitral valve of the heart
• Relative molecular mass, M_r
• Mega rayleigh (unit), a unit of luminous flux, used to measure air glow
• Milli röntgen, an obsolete unit of radioactive exposure

Music:

• Mister (band), a Canto-rock band

Miscellaneous:

• Mr. (artist), a Japanese artist
• Mouvement Réformateur, a Belgian political party
• Marathi language (mr ISO 639-1 code)
• Marginal revenue, an economics term
• MR (Marina and Rainer) (1989), one-act chamber opera by Nikolai Korndorf
• Market researcher, an occupation
• Master of the Rolls, in the UK legal system
• McCune-Reischauer, a system of romanization for the Korean language
• Mileage run, a paid/revenue airline trip solely to gain maximum frequent flyer miles or points
• Mountain rescue
• Mental ray, a 3D rendering application
• Rear mid-engine, rear-wheel drive layout, an automotive design with a mid-mounted engine driving the rear wheels