Malcolm David Whitworth (1904 – 3 July 1950) was a British motorcycle racer who died in a crash at the 1950 350 cc Belgian Grand Prix.

In the 500 cc race at the Ulster Grand Prix he finished third, behind Jock West and Ginger Wood.

At both the Dutch TT and the Belgian Grand Prix, Whitworth finished fourth in the 350 cc class resulting in sixth place in the overall championship standings.

Outside of the championship, Whitworth won the 350 cc race at the French Grand Prix in Saint-Gaudens.

He was riding a privately entered Velocette and was in a fight for fifth place with Harold Daniell, Ted Frend and Charlie Salt.