| Acronym | Definition |
|---|
| MR | Mister (title of address) |
| MR | Mentally Retarded |
| MR | Memory Recall (calculator button) |
| MR | Memorandum for Record |
| MR | Mauritania |
| MR | Motivation(al) Research |
| MR | Macro (assembly language ASM51 assembler control) |
| MR | Market Research |
| MR | Magnetic Resonance |
| MR | Medical Records |
| MR | Mental Retardation |
| MR | Maintenance Repair |
| MR | Matrix Reloaded |
| MR | Management Review |
| MR | Mutual Recognition (drug approval by local authorities, referring to other EU country approval) |
| MR | Moonraker (James Bond film) |
| MR | Member Resources |
| MR | Medium-Range |
| MR | Matchbook Romance (band) |
| MR | Message Received |
| MR | Monster Rancher (game) |
| MR | Multi-Rate |
| MR | Mini-Review |
| MR | Maintenance Release |
| MR | Maurice Ravel (classical composer) |
| MR | Mens Rea (criminal law) |
| MR | Mouvement Réformateur (Belgian political party) |
| MR | Moon Rise |
| MR | Mitral Regurgitation (heart) |
| MR | Master of the Rolls |
| MR | Multi Role |
| MR | Mahinda Rajapaksa (president of Sri Lanka) |
| MR | Mach Rider (gaming) |
| MR | Major Repair |
| MR | Model Railroader |
| MR | Michael Redd (NBA Player) |
| MR | Mobile Router |
| MR | Modified Release (pharmaceutics) |
| MR | Maintenance Request |
| MR | Magneto-Resistive |
| MR | Mineralocorticoid Receptor |
| MR | Manufacturer's Representative |
| MR | Magnetorheological (sometimes written as Magneto-Rheological) |
| MR | Minimal Residual |
| MR | Meet Record (sports) |
| MR | Main Rotor |
| MR | Measles-Rubella (vaccine) |
| MR | Middle Reliever (baseball) |
| MR | Materials Request |
| MR | Molecular Replacement |
| MR | Missile Radar |
| MR | Maintenance Responsibility |
| MR | Memory Resident |
| MR | Maintenance Requirement |
| MR | Moose River |
| MR | Miscellaneous Receipts |
| MR | Mercury Redstone |
| MR | McCloud River (railroad) |
| MR | Magic Resistance |
| MR | Minnesota Review (journal) |
| MR | Management Reserve |
| MR | Maintenance Review |
| MR | Modified Read |
| MR | Milk Replacer |
| MR | Marginal Return |
| MR | Moving Range (of observations) |
| MR | Mind Rape |
| MR | Modem Ready |
| MR | Air Mauritanie(Mauritania, IATA airline code) |
| MR | Monica Reyes (X-Files character) |
| MR | Machine Record |
| MR | Milliroentgen |
| MR | Molecular Response |
| MR | Marine Recon |
| MR | Maritime Reconnaissance |
| MR | Mars Relay (NASA) |
| MR | Mobile Route (postal) |
| MR | Militaires du Rang (Canada) |
| MR | Market Representative |
| MR | Michael Rabin (classical violinist) |
| MR | Monitor Room |
| MR | Mobile Receiver |
| MR | Machinery Repairman (USN Rating) |
| MR | Medium Rigid (vehicle license class) |
| MR | Milano Red (Honda paint color) |
| MR | Mode Request |
| MR | Milliradian |
| MR | Mean Rabbit |
| MR | Material Regulation |
| MR | Mishap Report |
| MR | Microwave R |
| MR | Material Requisition |
| MR | Malfunction Report |
| MR | Munitions Rule |
| MR | Movimiento Reformador (Guatemala political party) |
| MR | Maintenance Ratio |
| MR | Main Reflector |
| MR | Manufacturing Release |
| MR | Magnetic Roller |
| MR | Mouse Rug |
| MR | Mould Room |
| MR | Mobile Relay (repeater) |
| MR | Mail and Records |
| MR | Materiel Release |
| MR | Mis-Recognized (word) |
| MR | Monopulse Radar |
| MR | Mouvement Rodriguais (French: Rodrigues Movement, Mauritius) |
| MR | Mechanisms and Robotics Conference (American Society of Mechanical Engineers) |
| MR | Montreal Racing |
| MR | Missile Round |
| MR | War Tax Stamp (Scott Catalogue prefix; philately) |
| MR | Multiply Register (IBM) |
| MR | Modem Relay |
| MR | Micro Resources, Inc. |
| MR | Magneto-Restrictive |
| MR | Medium Rate Data (observations taken once per second) |
| MR | Molasses Residuum |
| MR | MacRepublic (website) |
| MR | Modification/Material Request |
| MR | Magnetiese Resonansie-Skandering |
| MR | Mid-Engine Rear-Wheel Drive |