GM is usually taken to mean General Motors Corporation, an automobile manufacturing company.

Other meanings include:

• GM1, a Ganglioside important in brain biochemistry
• Game Maker, a computer game developing program
• Gamemaster or Game Master, in play-by-mail games and role-playing games
• Gamemaster (board game series), a series of board games created by Milton Bradley
• General manager of an organisation, including sporting teams
• The General MIDI standard specification
• General Mills, a food manufacturing company
• General Motors Corporation, an automobile company.
• Grand Marquis, a Ford Mercury automobile brand
• Genetically modified, (a living thing) having its DNA intentionally changed for a particular outcome
• George Medal: a British decoration
• Germany, by its FIPS PUB 10-4 territory code
• Gmail, the email offering from Google
• Gold medal. In the UK rifle shooting community, a person who has won Her Majesty the Queen's Prize at Bisley, Surrey may subsequently put the letters GM ('gold medal') after his/her name
• Golden master, a single copy of a reproducible product, created for the purpose of duplication
• Grammatical modality, the mode in which the grammar of a sentence is constructed
• Greasemonkey - a program for letting users modify websites on-the-fly
• International Grandmaster in chess
• Genetic Modification or genetic engineering in general
• The Republic of The Gambia, a country in Africa (ISO 3166 digram)
• The RGM-79 GM mobile suit and its successors in the anime series Mobile Suit Gundam
• A Unified Soil Classification System symbol for silty gravel
• GM is the IATA code for Air Slovakia

Gm may mean:

• gigametre, an SI unit of length

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