| Country: | Australia |
| Season: | 1998–99 |
| Division1: | NSL Premiership |
| Champions1: | Sydney United |
| Division2: | NSL Championship |
| Champions2: | South Melbourne |
| Wdivision1: | WNSL Premiership |
| Wchampions1: | Canberra Eclipse |
| Wdivision2: | WNSL Championship |
| Wchampions2: | Canberra Eclipse |
| Prevseason: | 1997–98 |
| Nextseason: | 1999–2000 |
| Flagicon: | yes |
| Soccer: | yes |
The 1998–99 season was the 30th season of national competitive association football in Australia and 116th overall.
See main article: Australia men's national soccer team.
See main article: 1998–99 National Soccer League. Source: [1]
Source: [2]