Tom Barrett (21 November 1891 – 27 September 1924) was an English motor-racing riding mechanic.
His death in the 1924 San Sebastian Grand Prix brought an end to the practice of riding mechanics in two-seat racing cars.Racing in this early period was conducted between unreliable cars over long road courses, rather than by repeated laps of a dedicated short circuit.
There was no nearby "pit lane" in which to conduct repairs and so it was necessary to carry a mechanic on board the car.