1999–2000 Argentine Primera División
The 1999–2000 Argentine Primera División was the 109th season of top-flight football in Argentina. The season ran from August 7, 1999 to July 17, 2000.
As Conmebol extended the number of 2000 Copa Libertadores clubs from 23 to 34, four Argentine clubs were eligible to play the tournament. As Boca Juniors and River Plate had already qualified, Rosario Central and San Lorenzo earned their right to play the Copa Libertadores. On the other hand, Talleres de Córdoba replaced Gimnasia y Esgrima to play the 1999 Copa Conmebol after the club from La Plata declined to participate.
At the end of Torneo Clausura, the best five placed teams earned right to play the 2001 Copa Libertadores while six participants of 2000 Copa Mercosur were eligible by similar system.
River Plate won both, Apertura and Clausura championships. For the first time in Primera División, a promotion and relegation system was introduced. The two teams with the worst average were directly relegated to the second division while teams placed 17th and 18th in average played two leg series each with two teams from Primera B Nacional.
As a result, three teams were relegated, Ferro Carril Oeste, Gimnasia y Esgrima and Instituto . Belgrano remained in Primera after the series vs Quilmes ended 4–4 on aggregate.Apertura
League standings
Top scorers
Clausura
League standings
Top scorers
Relegation
Relegation table
Relegation playoffs
| Date | Home | Away | Result |
| July 20, 2000 | Quilmes | Belgrano | 3-1 |
| July 23, 2000 | Belgrano | Quilmes | 3-1 |
The teams draw 4-4 therefore Belgrano kept its place in Primera División, while Quilmes remained in Primera B Nacional.
- Almagro win 2-1 and promoted to Primera División.
- Instituto was relegated to the Primera B Nacional.
