2018 FFSA season
The 2018 Football Federation South Australia season was the 112th season of soccer in South Australia, and the sixth under the National Premier Leagues format.
League tables
2018 National Premier Leagues SA
The National Premier League South Australia 2018 season was the sixth edition of the NPL SA as the premier domestic association football competition in South Australia. 12 teams took part, all playing each other twice for a total of 22 rounds.League table
Finals
Leading Goalscorers
| Rank | Player | Club | Goals |
| 1 | Christian Esposito | North Eastern MetroStars | 18 |
| 2 | Anthony Costa | Adelaide City | 17 |
| 3 | Andreas Wiens | Adelaide Comets | 13 |
| 4 | Dion Kirk | Campbelltown City | 12 |
| 5 | Luigi Di Troia | Campbelltown City | 11 |
| 5 | Fausto Erba | Adelaide Olympic | 11 |
2018 SA State League 1
The 2018 SA State League 1 was the sixth edition of the NPL State League 1 as the second level domestic association football competition in South Australia. 12 teams competed, all playing each other twice for a total of 22 rounds.2018 SA State League 2
The 2017 SA State League 2 was the second edition of the new NPL State League 2 as the third level domestic association football competition in South Australia. 12 teams competed, all playing each other twice for a total of 22 rounds.2018 Women's NPL
The highest tier domestic football competition in South Australia for women was known for sponsorship reasons as the PS4 Women's National Premier League. This was the third season of the NPL format. The 8 teams played a triple round-robin for a total of 21 games.Cup competitions
2018 Federation Cup
South Australian soccer clubs competed in 2018 for the Federation Cup. Clubs entered from the NPL SA, the State League 1, State League 2, South Australian Amateur Soccer League and South Australian Collegiate Soccer League.This knockout competition was won by Adelaide Comets.
The competition also served as the South Australian Preliminary rounds for the 2018 FFA Cup. In addition to Adelaide Comets, A-League club Adelaide United qualified for the final rounds, entering at the Round of 32.