The 2018 British Champions Series, sponsored by QIPCO, was the eighth edition of the horse racing series comprising 35 of the UK's top flat races. The series began with the 2,000 Guineas at Newmarket on 5 May, and ended with British Champions Day at Ascot on 20 October.
The series was split into five categories: Sprint, Mile, Middle Distance, Long Distance and Fillies & Mares. Each category included seven races.
Horses were ranked according to their official BHA performance ratings in British Champions Series races during the season. Jockeys and trainers were ranked according to the number of wins, second places and third places they achieved during the series.