MR
- mr – (s) Marathi language (ISO 639-1 code)
- MR – (s) Mauritania (FIPS 10-4 country code; ISO 3166 digram)
- MR-ATGW – (i) Medium-Range Anti-Tank Guided Weapon
- MRAV – (i) Multi-Role Armoured Vehicle
- MRBM – (i) Medium Range Ballistic Missile
- MRC – (i) Maintenance Requirements Card
- MRD – (i) Motorized Rifle Division
- MRE – (i) Meal Ready to Eat (U.S. military rations)
- MRGO – (i) Mississippi River – Gulf Outlet Canal (also referred to as MR-GO or "Mr. Go")
- MRGW – (i) Medium-Range Guided Weapon
- mri – (s) Māori language (ISO 639-2 code)
- MRI – (i) Magnetic Resonance Imaging
- MRL – (i) Multiple Rocket Launcher
- MRO
- (i) Maintenance, Repair and Operating
- Mars Reconnaissance Orbiter
- (s) Mauritanian ouguiya (ISO 4217 currency code)
- MRPharmS – (i) Member of the Royal Pharmaceutical Society (Great Britain)
- MRR
- (i) Maximum Rock and Roll
- Minimum-Risk Route
- My Restaurant Rules
- MRS – (i) Magnetic Resonance Spectroscopy
- MRSA – (i) Methicillin-resistant Staphylococcus aureus
- MRT
- (i) Mass Rapid Transit — used as either an official or unofficial name for metro systems in Singapore, Kaoshiung, Bangkok, Taipei, Chennai, and Delhi
- (s) Mauritania (ISO 3166 trigram)
- MRTFB – (i) U.S. Major Range and Test Facility Base
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