The 1905 International Tourist Trophy was an automobile motor race held on 14 September 1905 on closed public roads along the Highroads Course on the Isle of Man. It was organised by the Automobile Club of Great Britain and Ireland, and was the first time that what became known as the RAC Tourist Trophy was awarded. The race lasted over six hours and was won by John Napier, driving an Arrol-Johnston. Percy Northey finished second in a Rolls-Royce, while the Vinot-Deguingand driver Norman Littlejohn was third.