The S. G. Ball Cup is a junior rugby league football competition played predominantly in New South Wales, between teams made up of players aged under 19. Teams from Canberra and Melbourne (Victoria Thunderbolts) also participate. Prior to the COVID-19 pandemic in New South Wales teams from Perth (West Coast Pirates) and Auckland (New Zealand Warriors) also participated. The competition is administered by the New South Wales Rugby League. The competition includes both junior representative teams of NRL and NSW Cup clubs that do not field a team in the NRL competition.