List of teams in the 2003 Tour de France

A list of the 22 teams competing in the 2003 Tour de France, sorted by country of origin. Each team started the race with nine riders. The teams are named after their main sponsor. The country indicates the origin of the team management setup, though for commercial reasons it is often the country of the sponsor as well. The name after each team is the team leader, but often the team leadership is not as clear-cut as a single name would appear to indicate. Also, the country and team leader often do not match. For example, only two teams sponsored by a company in an English-speaking country appeared in the 2003 Tour (Team CSC, US Postal), but the list of team leaders included three Americans, a Briton, and an Australian.

*flagicon|FRA France
** AG2R Prevoyance, Laurent Brochard
** Brioches La Boulangère, Didier Rous
** Cofidis, David Millar
** Crédit Agricole, Christophe Moreau
** FdJeux, Sandy Casar
** Jean Delatour, Patrice Halgand
*flagicon|ITA Italy
** Alessio, Laurent Dufaux
** Fassa Bortolo, Ivan Basso
** Saeco, Gilberto Simoni
** Vini Caldirola, Stefano Garzelli
*flagicon|ESP Spain
** Euskaltel-Euskadi (Basque origin), Iban Mayo
** iBanesto.com, Francisco Mancebo
** Kelme-Costa Blanca, Ignacio Gutierrez
** ONCE-Eroski, Joseba Beloki
*flagicon|GER Germany
** Bianchi, Jan Ullrich
** Gerolsteiner, Davide Rebellin
** Team Telekom, Santiago Botero
*flagicon|BEL Belgium
** Lotto-Domo, Robbie McEwen
** Quick·Step-Davitamon, Paolo Bettini
*flagicon|DEN Denmark
** Team CSC, Tyler Hamilton
*flagicon|NED Netherlands
** Rabobank, Levi Leipheimer
*flagicon|USA USA
** U.S. Postal, Lance Armstrong