What is a maiden race?

In horse racing parlance, a maiden is a horse – regardless of its age or sex – that has yet to win a race in its selected discipline. Thus, it follows, naturally, that a maiden race is a race in which none of the participants have won a race in their selected discipline. Maiden races are run on the Flat and under National Hunt Rules, so the situation is complicated, somewhat, by horses that progress from one discipline to another, as many do, throughout their careers. A horse that has won a Flat race, or a National Hunt Flat race, but not a hurdle race, is still eligible for a ‘maiden hurdle’ by virtue of never having won a race over obstacles, and so on.