Gene Transfer Agent, in genetics

Georgia Technology Authority, a government agency in Georgia (U.S. state)

Grand Theft Auto (series), a computer and video game series

Greater Toronto Area, the metropolitan area of Toronto

Greater Tokyo Area, the metropolitan area of Tokyo

Grand Theft Auto (video game), the first game in the series

Motor vehicle theft, a type of crime

Gran Turismo Allegerita, Alfa Romeo race car based on the Giulia, and current model designation

The Golden Tap Awards, an annual beer awards event held in Toronto, Ontario, Canada

Grand Theft Auto (film), the 1977 directorial debut of Ron Howard

The Golden Ticket Awards, the most prestigious awards in the amusement industry

Great Ayton railway station, England; National Rail station code GTA

Goleta (Amtrak station), California, United States; Amtrak station code GTA

Integrin alpha 2b, a protein

Alpine GTA, a French sport coupe