The 1904 Tour de France was the second Tour de France, held from 2 to 24 July. With a route similar to its previous edition, 1903 Tour de France winner Maurice Garin seemed to have repeated his win by a small margin over Lucien Pothier, while Hippolyte Aucouturier won four of the six stages. But the race became a victim of its own success, plagued by scandals; cyclists were accused of having taken trains during the race. Twelve cyclists, including the first four of the final classification and all stage winners, were disqualified by the Union Vélocipédique Française (UVF). Henri Cornet, originally the fifth-place finisher, was awarded the victory four months after the race. The problems caused the Tour de France to be provisionally cancelled, and subsequently the 1905 Tour de France was run with different rules from the 1903 and 1904 editions.

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.