| Acronym | Definition |
|---|
| MRS | Mistress (title of address) |
| Mrs | Misses (title of address) |
| MRS | Materials Research Society |
| MRS | Magnetic Resonance Spectroscopy |
| MRS | Market Research Society |
| MRS | Marsa (postal locality, Malta) |
| mRS | Modified Rankin Scale |
| MRS | Marginal Rate of Substitution |
| MRS | Model Railway Society |
| MRS | Monitored Retrievable Storage |
| MRS | Mobile Radio Service |
| MRS | Maintenance Repair & Service |
| MRS | Media Recognition System |
| MRS | Movimiento de Renovación Sandinista (Sandinista Renovation Movement, Nicaragua) |
| MRS | Microwave Remote Sensing |
| MRS | Melkersson-Rosenthal Syndrome |
| MRS | Air Marshall Islands (ICAO code) |
| MRS | Maritime Register of Shipping (Russia) |
| MRS | Military Railway Service (US Army) |
| MRS | Mobility Requirements Study |
| MRS | Minimum Required Strength |
| MRS | Message Relay Service |
| MRS | Managed Router Service (AT&T) |
| MRS | Mouse Rage Syndrome (website usability) |
| MRS | Mitochondria Research Society |
| MRS | Muzzle Reference Sensor |
| MRS | Monash Residential Services (Clayton, Victoria, Australia) |
| MRS | Mobile Remote Servicer |
| MRS | Minimum Reporting Standards |
| MRS | MIDI Recording Studio (Amiga and Atari ST software) |
| MRS | Missing Return Statement (software fault) |
| MRS | Market Regulation Services Inc |
| MRS | Medium Resolution Spectrometer |
| MRS | Main Supply Road |
| MRS | Maryland Relay Service (Telephone) |
| MRS | Mortality Reporting System |
| MRS | Molecular Replacement Solution |
| MRS | Michigan Radiological Society |
| MRS | Mini-Rawin System (meteorology) |
| MRS | de Man, Rogosa and Sharpe Agar (microbiology) |
| MRS | Marketing Requirements Specification |
| MRS | Measurements Repository System |
| MRS | Multiple Response Surface |
| MRS | Memo Routing Slip |
| MRS | Mine Roller System (US Marine Corps) |
| MRS | Medium-Range Sonar |
| MRS | Maintenance Requirements System (US Navy) |
| MRS | Modified Rogers Scale |
| MRS | Material Release Schedule |
| MRS | Moderator Recovery System |
| MRS | Maui Race Series (windsurfing) |
| MRS | Movement Reporting System |
| MRS | Mobile Radio Subsystem |
| MRS | Mission Recorder System |
| MRS | Melksham Referees Society (UK) |
| MRS | Managed RADIUS Service (Sprint) |
| MRS | MILA Relay System (NASA) |
| MRS | Markov Renewal Sequence |
| MRS | Main Ring Simulator |
| MRS | Mobility Response Squadron |
| MRS | Military Railway Switcher |
| MRS | Mobilization Reserve Stocks |
| MRS | Military Requirement Schedule |
| MRS | Main Reflector Surface |
| MRS | Mucus Recovery System (hospital billing code) |
| MRS | Military Enlistment Processing Reporting Subsystem |
| MRS | Mobilization Requirement Study |
| MRS | Multicommand Requirement Submission |
| MRS | Multiple Ramp Scheme |
| MRS | Multi-purpose Reproducer Set |
| MRS | Materiel Repair System |
| MRS | MILSTAR Remoting System |
| MRS | Management, Resource, and Support |
| MRS | Magnetiese Resonansspektro-Skopie |
| MRS | Midland Roller Sports |
| MRS | Make Ready for Sale (automobile dealers) |
| MRS | Marseilles, France - Marseille-Provence (Airport Code) |
| MRS | Mini-Reconstruction System |
| MRS | Mini Recording System |
| MRS | Miscellaneous Revenue System |
| MRS | Management Research Services (various locations) |
| MRS | Markov Regime Switching (forecasting) |
| MRS | Marine Recruiting Station |
| MRS | Mission Required Strength (US DoD) |
| MRS | Medical Review System |
| MRS | Modified Racing Series |
| MRS | Maximum Record Size (computing) |