GMT or Greenwich Mean Time is the mean solar time at the Royal Observatory in Greenwich, London.

GMT may also refer to:

• Generic Mapping Tools in graphical computing
• Geometric measure theory
• Giant Magellan Telescope, a telescope under construction in Chile 11
• GM GMT platform, an automobile platform
• Great Melbourne Telescope, built in Dublin, Ireland

• GATX, an American rolling stock leaser
• Granite Mountain Air Station, an airport in Alaska
• Greater Manchester Transport, in England
• Green Mountain Transit, a transportation company in Vermont
• Grosmont railway station, in England

• GMT (TV programme), UK
• Glycine/sarcosine N-methyltransferase, an enzyme
• G:MT – Greenwich Mean Time, a 1999 British film
• GMT Games, US
• GMT Records, a Japanese record label
• Goodman–Martinez–Thompson correlation, between the Mayan and Julian calendars
• Guy McCoy Tormé, a British rock-band
• Metal-Textile Union, a former Austrian trade union

This disambiguation page lists articles associated with the title GMT.
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