1990–91 Primera B Nacional
Quilmes A.C., champion | |
| Season | 1990–91 |
|---|---|
| Champions | Quilmes (1st divisional title) |
| Promoted | Quilmes Belgrano |
| Relegated | Tigre Cipolletti Atlanta |
| Top goalscorer | Roberto Oste (24 goals) |
← 1989–90 1991–92 → | |
The 1990–91 Argentine Primera B Nacional was the fifth season of second division professional of football in Argentina. A total of 22 teams competed; the champion and runner-up were promoted to Argentine Primera División.