Robert W. Kastner (30 August 1928 – 11 April 2021), commonly known as R.W. Kastner or Kas Kastner, was a builder and tuner of racing cars, a racing driver, and an author. He also raced sailing boats competitively. At different times he was Director of Motorsports in the United States for both the Triumph Motor Company and Nissan. Kastner has been called one of the most influential Americans in the history of Triumph cars. He coined the maxim "Never be beaten by equipment."