Gya or GYA may refer to: bya, symbol for gigayears ago, a unit of time equal to a billion 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