GRX

GRX may refer to:
 * GRX (1967): The engine and associated race car featured in the original 1967 series.
 * GRX (T-180): Royalton Industries' T-180 from the 2008 film and tie-in video game.
 * GRX-2: The vehicle featured in NOW Comics' The Haunted Engine/The Return of the GRX.