The 2015 AAA 400 was a NASCAR Sprint Cup Series race held on October 4, 2015, at Dover International Speedway in Dover, Delaware. Contested over 400 laps on the 1 mile (1.6 km) concrete speedway, it was the 29th race of the 2015 NASCAR Sprint Cup Series season, third race of the Chase and final race of the Challenger Round. Kevin Harvick won the race, his third of the season. Kyle Busch finished second. Dale Earnhardt Jr., Jamie McMurray and Aric Almirola rounded out the top–five.

The 2015 NASCAR Sprint Cup Series was the 67th season of professional stock car racing in the United States and the 44th modern-era Cup season. The season began at Daytona International Speedway with the Sprint Unlimited exhibition race, the Budweiser Duels, and the Daytona 500. The season ended with the Ford EcoBoost 400 at Homestead-Miami Speedway. Kyle Busch won the championship, despite missing the first third of the season due to severe leg injuries suffered in an Xfinity Series race at Daytona. Busch also became the first Toyota driver to win a Cup championship. Despite not running the full season, Brett Moffitt was named Rookie of the Year.