GMT may mean:

• Greenwich Mean Time
• Generic Mapping Tools in graphical computing
• Giant Magellan Telescope
• G:MT - Greenwich Mean Time, a 1999 film
• GMT Games
• GMT Records, an imprint/sub-label of Aozora Records
• Grosmont railway station, England; National Rail station code GMT
• Guy McCoy Tormé, a British rock-band
• Goodman, Martinez, Thompson correlation, the most commonly accepted correlation between the Mesoamerican Long Count calendar and the Julian calendar.

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