The 2003 NASCAR Winston West Series was the 50th season of the series and the final sponsored by Winston. The title was won by Scott Lynch, his first in the series.
The 2003 season included 12 individual races, although Phoenix International Raceway hosted two races. A thirteenth and final race, scheduled to run at California Speedway, was canceled due to the 2003 California wildfires.
() Bold â Pole position awarded by time. Italics â Pole position set by owner's points. * â Most laps led.