The 2005 Tour de France was a multiple stage bicycle race held from 2 July to 24 July 2005, and the 92nd edition of the Tour de France. It has no overall winner—although American cyclist Lance Armstrong originally won the event, the United States Anti-Doping Agency announced in August 2012 that they had disqualified Armstrong from all his results since 1998, including his seven Tour de France wins from 1999–2005; the Union Cycliste Internationale has confirmed this verdict.

The event comprised 21 stages over 3,592.5 km, the winner's average speed was 41.654 km/h. The first stages were held in the département of the Vendée, for the third time in 12 years. The 2005 Tour was announced on October 28, 2004. It was a clockwise route, visiting the Alps before the Pyrenees. Armstrong took the top step on the podium, for what was then the seventh consecutive time. He was accompanied on the podium by Ivan Basso and Jan Ullrich, but in 2012 Ullrich's results were annulled. The points classification was won by Thor Hushovd, and the mountains classification by Michael Rasmussen.