GSM is a common abbreviation for Global System for Mobile Communications (Groupe Spécial Mobile), the European group set up to establish European mobile telephony protocols and for telephony services using those protocols.

GSM may also refer to:

• The ICAO code for low cost airline Flyglobespan
• Gameshow Marathon (UK game show), a British television series
• Gameshow Marathon (US TV series), an American television series based on the above
• Gamma-Secretase Modulator, a new class of experimental drugs with potential to be useful in the treatment of Alzheimer's disease.
• Garrison Sergeant Major, a warrant officer appointment in the British Army
• General Service Medal, a British campaign medal
• Geocentric Solar Magnetospheric coordinate system
• Glass Sport Motors, a former South African car company
• Global Security Master, system used to retrieve securities data from vendors
• Graduate Studies in Mathematics, a series of mathematics texts published by the American Mathematical Society
• Graphic Standards Manual
• Great St. Mary's Church, Cambridge
• A red wine blend consisting of approximately equal parts of varieties Grenache, Shiraz, and Mourvèdre. The designation is common in Australia.

gsm may refer to:

• Generalized sequential machine in automata theory
• Grams per square metre, an indication of paper density
• Grams per square metre, an indication of fabric density, normally reported in test/analysis results of fabrics
• A file format and filename extension used by the company Graphisoft for ArchiCAD library parts mainly written in Geometric Description Language (GDL)
• A file format and filename extension, with GSM-like codified voice (with variants. Full Rate is the simplest), as used by GSM mobile phones and other sound handling programs, like asterisk (PBX) or SoX.

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