2023 NASCAR Cup Series

The 2023 NASCAR Cup Series was the 75th season for NASCAR professional stock car racing in the United States and the 52nd season for the modern-era Cup Series. The season started with the Busch Light Clash at the Los Angeles Memorial Coliseum on February 5. That race was followed by the Daytona Duel qualifying races and the 65th running of the Daytona 500 (the first points race of the season) on February 19, both at Daytona International Speedway. The season ended with the NASCAR Cup Series Championship Race at Phoenix Raceway on November 5.

This was the final season for 2014 champion and Stewart–Haas Racing driver Kevin Harvick, who announced his plans to retire at the end of the season on January 12, 2023. This was also the first season since 1999 without 2004 champion Kurt Busch, who announced on October 15, 2022, that he would retire from full-time Cup Series competition. On August 26, 2023, Busch announced his complete retirement from the Cup Series.

Following the 2023 Coke Zero Sugar 400 at Daytona, Martin Truex Jr. of Joe Gibbs Racing clinched the regular season championship. Ty Gibbs, also of Joe Gibbs Racing, won NASCAR Rookie of the Year honors after Noah Gragson was suspended and released from Legacy Motor Club in August 2023. Prior to the Xfinity 500 at Martinsville, Chevrolet claimed its 42nd Manufacturers' Championship. At season's end, Ryan Blaney of Team Penske won the 2023 championship.