| MARS | Mac Address Registration System 
| Others |
| MARS | Machine Addressed Reading Software
| Others |
| MARS | Machine Assisted Reference Section
| Others |
| MARS | Machine Assisted Reference Services
| Others |
| MARS | Machine Learning, Automation, Robotics, and Space
| Others |
| MARS | Magenn Air Rotor System
| Others |
| MARS | Mains Active Restoring System
| Others |
| MARS | Maintenance And Ramp Safety
| Others |
| MARS | Making All Recreation Safe
| Others |
| MARS | Management Administrative And Reporting System
| Others |
| MARS | Management And Reporting System
| Others |
| MARS | Manga Anime Review Site
| Others |
| MARS | Manitou Air Response System
| Others |
| MARS | Manual Audience Response System
| Others |
| MARS | Marine Accident Reporting Scheme
| Others |
| MARS | Mariners Alerting and Reporting Scheme
| Others |
| MARS | Marketing Advertising Retail and Sales
| Others |
| MARS | Martin Automatic Reporting System
| Others |
| MARS | Massive Amounts of Random Structures
| Others |
| MARS | Math And Reading Scholars
| Others |
| MARS | Mathematics Assessment Resource Service
| Others |
| MARS | Mathewson Automated Retrieval System
| Others |
| MARS | Matulich And Rowe Studios
| Others |
| MARS | Mayfield And Ragni Studio
| Others |
| MARS | Measurable Accessible Responsive Substantial
| Others |
| MARS | Mechanized Assault Recon And Strike
| Others |
| MARS | Media And Resource Services
| Others |
| MARS | Medical Amateur Radio Society
| Others |
| MaRS | Medical and Related Sciences
| Others |
| MARS | Medication Adherence Rating Scale
| Others |
| MARS | Medication Allocation Records
| Others |
| MARS | Meeting And Reservation Service
| Others |
| MARS | Member Audio Response System
| Others |
| MARS | Meteorological Automatic Reporting System
| Others |
| MARS | Microprogrammable Accelerator For Rapid Simulations
| Others |
| MARS | Microsoft Alphanumeric Recognition System
| Others |
| MARS | Microsoft Azure Recovery Services
| Others |
| MARS | Mid American Racing Series
| Others |
| MARS | Mid-Air Refueling Squadron
| Others |
| MARS | Middlebury Automated Registration System
| Others |
| MARS | Midwest Association of Rail Shippers
| Others |
| MARS | Milestones Actions Relationships Schedules
| Others |
| MARS | Military Affiliated Radio Service
| Others |
| MARS | Military Affiliated Radio Services
| Others |
| MARS | Military Armaments Research Syndicate
| Others |
| MARS | Military Arms Research Syndicate
| Others |
| MARS | Military Auxiliary Radio System
| Others |
| MARS | Militians At Ready Stance
| Others |
| MARS | Milwaukee Area Radio Stations
| Others |
| MARS | Mini Assault Rifle System
| Others |
| MARS | Minolta Automated Retrieval System
| Others |
| MARS | MIPS Assembler and Runtime Simulator
| Others |
| MARS | MIPS Assembly and Runtime Simulator
| Others |
| MARS | Mitigation And Response System
| Others |
| MARS | Mobile Access and Retrieval System
| Others |
| MARS | Mobile Adjustable Ramp System
| Others |
| MARS | Mobile Agricultural Robot Swarms
| Others |
| MARS | Mobile Assault Rescue And Strike
| Others |
| MARS | Mobile Assault, Rescue, and Security
| Others |
| MARS | Mobile Audience Response Systems
| Others |
| MARS | Mobile Augmented Reality Sytems
| Others |
| MARS | Mobile Automated Regulatory Services
| Others |
| MARS | Model Agency Rating System
| Others |
| MARS | Modelling Animation And Rendering System
| Others |
| MARS | Modular Airborne Recorder System
| Others |
| MARS | Molecular Adsorbent Recirculating System
| Others |
| MARS | Monitoring Action Research System
| Others |
| MARS | Monitoring Analysis and Response System
| Others |
| MARS | Mono Analog Rack Synthesizer
| Others |
| MARS | Monotone Advection and Reconstruction Scheme
| Others |
| MARS | Monterey Accelerated Research System
| Others |
| MARS | Mortgage Assistance Relief Services
| Others |
| MARS | Motor Alternator Reversible System
| Others |
| MARS | Mountain Area Research Section
| Others |
| MARS | Mountain Astronomical Research Section
| Others |
| MARS | Moving Armature Red Signal
| Others |
| MARS | Muffin Andrew Rugby Start
| Others |
| MARS | Multi-Agency Referral Service
| Others |
| MARS | Multicast Address Resolution Server
| Others |
| MARS | Multicast Address Resolution Service
| Others |
| MARS | Multimedia Archaelogical Research System
| Others |
| MARS | Multiple Access Radio Systems
| Others |
| MARS | Multiple Active Result Sets
| Others |
| MARS | Multiuser Archival and Retrieval System
| Others |
| MARS | Multivariate Adaptive Regression Splines
| Others |
| MARS | Multivariate Additive Regression Splines
| Others |
| MARS | Museum Astronomical Resource Society
| Others |
| MARS | Music And Recording Superstore
| Others |
| MARS | Music And Recording Superstores
| Others |
| MARS | Mutually Agreed Resignation Scheme
| Others |