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'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

★ 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

★ A wine blend consisting of approximately equal parts grenache, shiraz, and mourvèdre
'gsm' may refer to:

★ Generalized sequential machine in automata theory

★ Grams per square metre, an indication of paper density

★ 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 , as used by GSM mobile phones and elsewhere (eg asterisk PABX)