| MS | Microsoft | |
| MS | Master of Science (degree) | |
| MS | Middle School | |
|
| MS | Mississippi (US postal abbreviation) | |
| MS | Mail Stop | |
| MS | Mail Server | |
| MS | Medical Student | |
| MS | Masters of Science (less common) | |
| MS | Mobile Station | |
| MS | Market Share | |
| MS | Management System | |
| MS | Management Services | |
| MS | Management Science | |
| MS | Member States (EU) | |
| MS | Mobile Suit (Gundam World) | |
| MS | Most Significant | |
|
| MS | Medical Services | |
| MS | Member State | |
| MS | Memory Stick | |
| MS | Mass Storage | |
| MS | Media Server | |
| MS | Mint State (highest quality of coin) | |
| ms | measures (music score) | |
| MS | Mean Square | |
| MS | Master Schedule | |
| MS | Memory System | |
| MS | Military Science | |
| MS | Morgan Stanley (investment bank) | |
| MS | Monitoring System | |
| MS | Message Store | |
| MS | More Stuff (polite form) | |
| MS | Maple Story (MMORPG) | |
| M/S | Modeling and Simulation | |
| MS | Maple Story (computer game) | |
| MS | Master System (Sega) | |
| MS | Message System | |
| MS | Multiple Sclerosis Society of Canada | |
| MS | Medical Surgical | |
| MS | Market Survey | |
| MS | Multiple Sclerosis | |
| MS | Manuscript | |
| MS | Midnight Sun (band) | |
| MS | Metabolic Syndrome | |
| MS | Mode Select | |
| MS | Marine Safety | |
| MS | Milestone | |
| MS | Mild Steel | |
| MS | Mission Specialist | |
| MS | Mass Spectroscopy | |
| MS | Meets Standards (school grading system) | |
| MS | Mass Spectrometry | |
| MS | Modern Studies (school subject) | |
| MS | Mato Grosso do Sul (Brazil) | |
| MS | Mass Spectrometer | |
| MS | Memory Store (calculator button) | |
| M/S | Meter(s) per Second | |
| MS | Mad Scientist | |
| MS | Mediterranean Sea | |
| MS | Metal Slug (game) | |
| Ms | Mariners (Seattle baseball team) | |
| MS | Mobility Solutions (Lucent) | |
| M/S | Milestone | |
| MS | Morphine Sulfate | |
| MS | Massa Carrara (postcode, Italy) | |
| MS | Metric System | |
| MS | Marks and Spencer (UK department store) | |
| MS | Mail Store | |
| MS | Maintenance Shop | |
| MS | Minesweeper | |
| MS | MySpace | |
| ms | Millisecond | |
| MS | Michael Schumacher (F1 driver) | |
| MS | Merchant Shipping | |
| M/S | Master/Slave | |
| MS | Martin Scorsese (film director) | |
| MS | Mid-Side (stereo sound recording) | |
| MS | Medium Speed | |
| MS | Major System | |
| MS | Marge Simpson | |
| MS | Mobile Subscriber | |
| MS | Maybe So | |
| MS | Moderately Susceptible | |
| MS | Mario Sunshine (video game) | |
| MS | Machine Screw | |
| MS | Market Surveillance | |
| MS | Egyptair (IATA airline code) | |
| MS | Multi-Spectral | |
| MS | Market Segmentation | |
| MS | Manual Switch | |
| MS | Matrix Spike | |
| MS | Mara Salvatrucha (gang) | |
| MS | Magnetic Storage | |
| MS | Missile System | |
| MS | Musculo-Skeletal | |
| MS | Mono Stereo | |
| MS | Margin of Safety (structural engineering term) | |
| MS | Mother Ship (game) | |
| MS | Medical Service Corps | |
| MS | Murashige and Skoog (basal medium) | |
| MS | Manufacturing Specialist | |
| MS | Mitral Stenosis (medical) | |
| MS | Mission Simulator | |
| Ms | Surface Wave Magnitude (formula for measuring earthquakes) | |
| MS | Main Station | |
| MS | Mobility Support | |
| MS | Multidimensional Scaling | |
| M/S | Messieurs (plural of Mister) | |
| MS | Marking Scheme (examinations) | |
| MS | Medium Shot (cinematography) | |
| MS | Master Switch | |
| MS | Matched Set (philately) | |
| MS | Medical Superintendent | |
| MS | Mike Shinoda (Linkin Park band member) | |
| MS | Michael Shanks (actor) | |
| MS | Multiplex Section | |
| MS | Manufacturing Strategy | |
| MS | Maggie Simpson | |
| M/S | miles per second | |
| MS | Microwave System | |
| MS | Master Sommelier | |
| MS | Models and Simulations (Conference) | |
| MS | Mission: Space (Epcot, Walt Disney World, Florida) | |
| MS | Male Sterile | |
| MS | Motor Ship (nautical vessel designation; also see SS for steam ship) | |
| MS | Music/Speech (broadcasting) | |
| MS | Message Switch | |
| MS | Man System (CASI) | |
| MS | Main Spring | |
| MS | Master Shake (cartoon character) | |
| MS | Measurement Signal | |
| MS | Microprocessor System (AT&T) | |
| M/S | Minesweeping | |
| MS | Main Steam (valve in nuclear submarine) | |
| MS | Monitor Station | |
| MS | Master Sword (Legend of Zelda Game) | |
| MS | Million Samples (sampling rate) | |
| MS | Marketing Society | |
| MS | Mortal Strike (gaming, World of Warcraft) | |
| MS | Motorschiff (German: motor vessel) | |
| MS | Memoserv (IRC Memo Server) | |
| MS | Master of Surgery | |
| MS | Military Shipping | |
| MS | Maintenance Standard | |
| MS | Markov Switching | |
| MS | Music Scholar (Eton College) | |
| MS | Manganese Steel | |
| MS | Munchausen's Syndrome | |
| MS | Morneau Sobeco | |
| M/S | Motor Ship | |
| MS | Metal Sonic (gaming character) | |
| MS | Magical Sword (Legend of Zelda game) | |
| MS | Medical Survey | |
| MS | Mission Schedule | |
| MS | Motor Spirit (petroleum) | |
| MS | Microwave Sensor | |
| MS | Mandatory Supervision (type of parole) | |
| MS | Mirage Studios | |
| MS | Master of Sports | |
| MS | Missile Squadron | |
| MS | Master Smith (bladesmithing) | |
| Ms | Milksolids | |
| MS | Master Seaman (Canadian Forces naval rank) | |
| MS | Modified Silicone | |
| MS | MirrorSoft (former game maker) | |
| MS | Mild Severe (British rock climbing grade) | |
| MS | Mammal Society | |
| MS | Motorschip (Dutch) | |
| MS | Monitoring Subsystem | |
| MS | Mint Sheet (of stamps) | |
| MS | Mobilization Station | |
| M/S | Miniature Sheet (of stamps) | |
| MS | Michele Soavi (film director) | |
| MS | Main Satellite | |
| MS | Motor Signal | |
| MS | Microwave Switch (electromechanics) | |
| MS | Mirrored System | |
| MS | Mess Management Specialist (US Navy rating) | |
| MS | Medium Steel | |
| MS | Mechanics Service | |
| MS | Model Station | |
| M/S | Message Switch | |
| MS | Maple Sea (Maple Story gaming) | |
| MS | Massa, Toscana (Italian province) | |
| MS | Mannose-Sensitive | |
| MS | Mouvement Socialiste (French: Socialist Movement) | |
| MS | Magestorm (game) | |
| MS | Mega Sample (Electronic Data Acquisition Systems) | |
| MS | Motor Saw | |
| MS | Manual Sweep (Agilent) | |
| MS | Millenial Star (LDS Church) | |
| MS | Maternal Sire | |
| MS | Michigan Shore Railroad | |
| MS | Michigan Southern Railway | |
| MS | Maintenance Shelter | |
| MS | Military Score (gaming) | |
| MS | McLean Symphony (McLean, VA) | |
| MS | Missile Station (linear measurement reference to key points on a missile) | |
| MS | Minimal Subtraction | |
| MS | Meta Signaling | |
| MS | Marine Science Technician | |