The 2015 National League was the seventh season of the National League, the third tier of British speedway. The Cradley Heathens were the defending champions after winning the competition in 2014. Cradley finished the 2015 season in third place, as the Birmingham Brummies won the championship title; with 14 wins from 18 matches, the Brummies won the title after a 47–42 victory at the Mildenhall Fen Tigers in September, and ultimately finished 6 points clear of the Eastbourne Eagles.