The 2003 UAW-DaimlerChrysler 400 was the third stock car race of the 2003 NASCAR Winston Cup Series season and the sixth iteration of the event. The race was held on Sunday, March 2, 2003, in North Las Vegas, Nevada at Las Vegas Motor Speedway, a 1.5 miles (2.4 km) permanent D-shaped oval racetrack. The race took the scheduled 267 laps to complete. At race's end, Matt Kenseth of Roush Racing would dominate the late stages of the race to win his seventh career NASCAR Winston Cup Series win and his first and only win of the season.^[1] To fill out the podium, Dale Earnhardt Jr. and Michael Waltrip of Dale Earnhardt, Inc. would finish second and third, respectively.

Las Vegas Motor Speedway, located in Clark County, Nevada outside the Las Vegas city limits and about 15 miles northeast of the Las Vegas Strip, is a 1,200-acre (490 ha) complex of multiple tracks for motorsports racing. The complex is owned by Speedway Motorsports, Inc., which is headquartered in Charlotte, North Carolina.

Qualifying was held on Friday, February 28, at 3:05 PST.^[2] Positions 1-36 would be decided on time, while positions 37-43 would be based on provisionals. Six spots are awarded by the use of provisionals based on owner's points. The seventh is awarded to a past champion who has not otherwise qualified for the race. If no past champ needs the provisional, the next team in the owner points will be awarded a provisional.^[6]

Bobby Labonte of Joe Gibbs Racing would win the pole, setting a time of 31.211 and an average speed of 173.016 miles per hour (278.442 km/h).^[7]

Greg Biffle would be the only driver to fail to qualify.