The league competition was played amongst eight separate divisions, divided by FFA state and territory member federations.
Campbelltown City were crowned National Premier Leagues Champions and qualified directly for the 2019 FFA Cup Round of 32.
The winner of each league competition (top of the table) in the NPL will compete in a single match knockout tournament to decide the National Premier Leagues Champion for 2018.
The quarter final match-ups were decided by an open draw.
[7] The winner will additionally qualify for the 2019 FFA Cup Round of 32.