| 2003 CART season | |
|---|---|
| Bridgestone Presents the Champ Car World Series Powered by Ford | |
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| Season | |
| Races | |
| Start date | February 23 |
| End date | October 26 |
| Awards | |
| Drivers' champion |  Paul Tracy |
| Constructors' Cup |  Lola |
| Nations' Cup | Canada |
| Rookie of the Year |  Sébastien Bourdais |
The 2003 Champ Car World Series, the twenty-fifth and final in the Championship Auto Racing Teams (CART) era of American open-wheel car racing, consisted of 18 races, beginning in St. Petersburg, Florida, United States on February 23 and concluding in Surfers Paradise, Queensland, Australia on October 26. For sponsorship purposes, it was branded as Bridgestone Presents the Champ Car World Series Powered by Ford.
The intended final event, scheduled to be held in Fontana, California on November 9 was canceled due to wildfires, one of which was known as the "Grand Prix Fire", burning in and around San Bernardino County.
The Drivers' Champion was Paul Tracy. Rookie of the Year was Sébastien Bourdais. At the end of the season, the operations of a now bankrupt CART were assumed by Open-Wheel Racing Series, who continued to brand its top series as the Champ Car World Series.
The season was the first since 1993 not to feature Michael Andretti.