GTT is an acronym that may stand for:

• Gunnery Training Team, a British Army training consultancy.
• Global Title Translation, an operation in Signalling System #7
• Glucose tolerance test, a common test for diagnosing diabetes
• Gone to Texas, a phrase used by Americans immigrating to Texas in the 19th century
• Gruppo Torinese Trasporti (abbrevied GTT), the public transportation company of the city of Turin, Italy
• Guttae (medical), abbreviated gtt., a term used in medical prescriptions meaning drops (from the Latin "guttae", drops)
• Guntram's Tabletweaving Thingy, a program to design tablet weaving patterns.
• Gateway To Technology, a middle school course outlining drawing and design.

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