The S. G. Ball Cup is a junior rugby league football competition played predominantly in New South Wales, between teams made up of male players aged under 19. Teams from Canberra and Melbourne, and Auckland (New Zealand Warriors) also participate. Prior to the COVID-19 pandemic in New South Wales a team from Perth (West Coast Pirates) 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. The S. G. Ball Cup is named after S. G. "George" Ball, one of the five people responsible for the formation of the South Sydney Rabbitohs, and who was club secretary for over fifty years.

Clubs

In 2023, 16 clubs fielded teams in the NSWRL S G Ball Cup. In 2020, 18 clubs fielded teams in the NSWRL S G Ball Cup. After the sixth round on March 14 & 15, the 2020 competition was suspended and subsequently cancelled due to the COVID-19 pandemic in Australia. Three teams from 2020 that did not return in 2021 were: Previous teams that participated in the SG Ball Cup include: Gold Coast Titans (2008–09), Newtown Jets (1970s, early 1980s & 2009), Western Sydney Academy of Sport (2007–17). Melbourne Storm competed in the S.G. Ball Cup from 2009 to 2014, did not compete from 2015 to 2018, and competed as the Victoria Thunderbolts from 2020 to 2022. The club returned as the Melbourne Storm from the 2023 season.

S. G. Ball Cup Premiers

1965 to Current

Premiership Tally

Bold means the team still currently play in the competition.