The NSWRL Harold Matthews Cup is a junior rugby league competition played in New South Wales between teams made up of players aged under 17.

The New Zealand Warriors joined the competition in 2024, having previously fielded teams in the older age S.G. Ball Cup.

The Melbourne Storm re-joined the Harold Matthews Cup in 2024, having previously fielded a team in the 2013 and 2014 seasons.

In the 1970s and early 1980s the Harold Matthews Cup was played in a carnival format over three to five successive days.

After the sixth round on 14 & 15 March, the 2020 competition was suspended and subsequently cancelled due to the COVID-19 pandemic in Australia.