MGY or a variant thereof is used as an abbreviation for:

• Megagray (MGy) and milligray (mGy), SI derived units of the gray (absorbed radiation dose)
• mgy, MGY, mmgy, MMgy, or MMGY: Million gallons per year

MGY as an identifier has been used to denote:

• Dayton-Wright Brothers Airport, IATA code
• Montgomeryshire, historic county in Wales, Chapman code
• The maritime call sign of RMS Titanic's radiotelegraph station

MGY may also refer to:

• MG Y-type, an MG car

This disambiguation page lists articles associated with the title MGY.
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