The 1991 NASCAR Winston Cup Series was the 43rd of professional stock car racing in the United States and the 20th modern-era Cup Season. It began February 10 and ended November 17. Dale Earnhardt of Richard Childress Racing won his fifth Winston Cup championship at the conclusion of the season. The season was marred by the death of driver and team owner J. D. McDuffie, who was killed in a wreck at Watkins Glen. This would be the last season until 2017 without Jeff Gordon.