The competition consisted of four divisions across the state of New South Wales, excluding those regions affiliated with the Northern NSW Football federation.
Blacktown City won this competition, becoming the 2015 National Premier Leagues Champion, and additionally received a spot in the 2016 FFA Cup (entering at the Round of 32).
The National Premier League New South Wales 2015 season was played over 22 rounds, from March to August 2015.
The tournament doubled as the NSW qualifier for the 2015 FFA Cup, with the top five clubs progressing to the Round of 32.
The five winners then were randomly drawn in order to create a preliminary fixture, before the semi-finals of the competition.