The 2015 World of Outlaws Sprint Car Series season was the 37th season of the winged sprint car series in North America. The season began with the DIRTcar Nationals at Volusia Speedway Park on February 13, and ended with the Bad Boy Buggies World of Outlaws World Finals at The Dirt Track at Charlotte on November 8. Donny Schatz entered the season as the defending series champion, and clinched the 2015 championship, his seventh overall, after a second-place finish in the National Open at Williams Grove Speedway on October 4.