1998–99 Primera B Nacional
| Season | 1998–99 |
|---|---|
| Champions | Instituto (1st divisional title) |
| Promoted | |
| Relegated | |
| Top goalscorer | Adrián Czornomaz 26 goals |
← 1997–98 | |
The 1998–99 Argentine Primera B Nacional was the 13th season of second division professional of football in Argentina. A total of 33 teams competed; the champion and runner-up were promoted to Argentine Primera División.