MGS

• Maidstone Grammar School, Kent, England, UK
• Manchester Grammar School, England, UK
• Mayo Clinic Graduate School of Biomedical Sciences, U.S.
• Melbourne Grammar School, Australia
• Meldorfer Gelehrtenschule, Germany
• Middleton Grange School, New Zealand

• Magnesium sulfide, an inorganic chemical compound
• Mars Global Surveyor, an American spacecraft launched in 1996
• Medial gastrocnemius strain, an injury of the gastrocnemius muscle in the calf
• Modelling of General Systems, a domain-specific language for biological systems
• Modified Gram-Schmidt, a mathematical method for orthogonalizing a set of vectors; see {{slink|Gram–Schmidt process|Numerical stability}}

• Metal Gear Solid, another name for the 1987 stealth action video game series Metal Gear
• Metal Gear Solid (1998 video game), a stealth action video game in the Metal Gear series

• M1128 mobile gun system, an armored fighting vehicle
• Microsoft Game Studios, a multinational video game and digital entertainment company now called Xbox Game Studios
• MGS (TV station)

• Methodist Girls' School (disambiguation)
• MG (disambiguation)

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