A-League Youth, formerly known as the National Youth League and Y-League, is an Australian national soccer youth developmental and under-21s league, founded by Football Federation Australia and now run by the . The current league was established as a successor to the previous competition of the National Youth League (1984–2004) and commenced in August 2008. The league runs in conjunction with the A-League Men as a developmental or reserve league. The men’s, women’s and youth leagues brought together under a unified A-Leagues banner.