Mr. is an honorific title of men, see also Master (form of address).
MR may also refer to:
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)
- 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
In science:
- Mathematical Reviews, a database of reviews of mathematics publications
- Magnetic resonance
- Magnetoresistance
- Mental retardation, a developmental disorder
- Mineralocorticoid receptor
- Mitral regurgitation, leaking of the mitral valve of the heart
- Relative molecular mass
- Mega rayleigh (unit), a unit of luminous flux, used to measure air glow
- Mega röntgen, an obsolete unit of radioactive exposure
Miscellaneous:
- 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
- Matthew Reilly, and Australian author
- 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
- Mahinda Rajapaksa, current president of Sri Lanka
- Medium Rare, a way to prepare meat
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