The 1905 Tour de France was the third edition of the Tour de France, held from 9 to 30 July, organised by the newspaper L'Auto. Following the disqualifications after the 1904 Tour de France, there were changes in the rules, the most important one being the general classification not made by time but by points. The race saw the introduction of mountains in the Tour de France, and René Pottier excelled in the first mountain, although he could not finish the race. Due in part to some of the rule changes, the 1905 Tour de France had less cheating and sabotage than in previous years, though they were not eliminated. It was won by Louis Trousselier, who also won four of the eleven stages.

The Tour de France is an annual men's multiple-stage bicycle race held primarily in France. It is the oldest of the three Grand Tours and is generally considered the most prestigious.