| MGS | Machine Grain Surlyn 
| Others |
| MGS | Machine Groomed Snow
| Others |
| MGS | Mad Gecko Studios
| Others |
| MGS | Magic Game Station
| Others |
| MGS | Magnificent Girls School
| Others |
| MGS | Maharaja Ganga Singh
| Others |
| MGS | Main Gun System
| Others |
| MGS | Maine Geological Survey
| Others |
| MGS | Malaysian Government Securities
| Others |
| MGS | Malignancy Grading System
| Others |
| MGS | Manchester Grammar School
| Others |
| MGS | Mangaia Airport
| Others |
| MGS | Mangaia Island, Cook Island, South Pacific
| Others |
| MGS | Manifold Gasket Set
| Others |
| MGS | Marriott Global Source
| Others |
| MGS | Mars Global Surveyor
| Others |
| MGS | Martin G. Scheufler Kunstharzprodukte, GmbH
| Others |
| MGS | Maryland Geological Survey
| Others |
| MGS | Mason Gray Strange
| Others |
| MGS | Max-Gain Systems, Inc.
| Others |
| MGS | Mean Girls School
| Others |
| MGS | Meckel Gruber syndrome
| Others |
| MGS | Meckel-Gruber Syndrome
| Others |
| MGS | Media Gateway Server
| Others |
| MGS | Media Gateway Switch
| Others |
| MGS | Melbourne Grammar School
| Others |
| MGs | Membranous Glomerulosclerosis
| Others |
| MGS | Meme Gene Scene
| Others |
| MGS | Metal Games Sgforums
| Others |
| MGS | Metal Gay Solid
| Others |
| MGS | Metal Gear Selfie
| Others |
| MGS | Metal Gear Solid
| Others |
| MGS | Metel Gear Solid
| Others |
| MGS | Methodist Girls School
| Others |
| MGS | Methodist Girls' School
| Others |
| MGS | Michael George Smith
| Others |
| MGS | Michigan Geological Survey
| Others |
| MGS | Microsoft Game Studios
| Others |
| MGS | Middleton Grange School
| Others |
| MGS | Midlands Graduate School
| Others |
| MGS | Minimum Government Standard
| Others |
| MGS | Ministry of Government Services
| Others |
| MGS | Mission Ground Station
| Others |
| MGS | Mississippi Geological Society
| Others |
| MGS | Mobile Ground System
| Others |
| MGS | Mobile Growth Summit
| Others |
| MGS | Mobile Gully System
| Others |
| MGS | Mobile Gun System
| Others |
| MGS | Modified Gram-Schmidt
| Others |
| MGS | Molan Gold Standard
| Others |
| MGS | Molecular Genetics of Schizophrenia
| Others |
| MGS | Morris Garages The Shop
| Others |
| MGS | Multi Geometry Simulation
| Others |
| MGS | Multiple Game Squad
| Others |
| MGS | Multiple Geek Syndrome
| Others |
| MGS | Muscle Gaining Scam
| Others |
| MGS | Muscle Glycogen Synthase
| Others |
| MGS | Must Get Spinach
| Others |
| MGs | Mystique Gs
| Others |