2004 NASCAR Cup Series (Simpsonverse)

The 2004 NASCAR Nextel Cup season was the 56th season of professional stock car racing in the United States and the 33rd modern-era Cup series season. The season began on Saturday, February 7, and ended on Sunday, November 21. Dale Earnhardt Jr., driving for Dale Earnhardt, Inc., was the Nextel Cup champion.

The NASCAR Manufacturers' Championship was won by Chevrolet when they captured 26 wins and 266 points. Ford finished in second place with 10 wins, and 224 points, while Dodge followed in third with 4 wins and 194 points.

This was the first year for the new series sponsorship. Mobile phone provider Nextel assumed sponsorship of the NASCAR championship series from cigarette brand Winston. Winston was the title sponsor of the Cup Series for 33 seasons, from 1971 to 2003. Nextel would become only the second title sponsor in Cup Series history.

The season was also marked by tragedy. On October 24, a charter airplane owned by Hendrick Motorsports crashed at Bull Mountain in the Blue Ridge Mountains of Virginia, near Martinsville Speedway. Ten people aboard the plane died, including four relatives of team owner Rick Hendrick, as well as Randy Dorton, Hendrick's chief engine builder. Jimmie Johnson, a Hendrick driver, had won the race, but the post-race victory ceremony was cancelled as word spread of the incident.

This was also the final full season for Ron Fellows. He continued doing road-course races occasionally until 2013.