Gya or GYA may refer to:
*
Gya (unit), symbol for ''gigayears ago'', a unit of time equal to one billion (short-scale, i.e. 1,000,000,000) years before present.
* Gya, symbol for the
gray, a unit of radiation exposure, equal to 100
roentgen
*
Gya, Ladakh, a village in India
*
Global Young Academy, an association of early-career scientists
*
Guayaramerín Airport, an airport in Bolivia
*
Gulf Yachting Association, a boating organization on the United States coast along the Gulf of Mexico
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