| Tourney Name: | Supercopa Libertadores |
| Year: | 1990 |
| Other Titles: | 1990 Supercopa Libertadores João Havelange |
| Dates: | 18 October 1990 – 11 January 1991 |
| Num Teams: | 13 |
| Confederations: | 4 |
| Champion Other: | Olimpia |
| Count: | 1 |
| Second Other: | Nacional |
| Matches: | 24 |
| Goals: | 61 |
| Top Scorer: |  Raúl Vicente Amarilla(7 goals) |
| Prevseason: | 1989 |
| Nextseason: | 1991 |
The 1990 Supercopa Libertadores was the third season of the Supercopa Libertadores, a club football tournament for past Copa Libertadores winners. The tournament was won by Olimpia, who beat Nacional 6–3 on aggregate in the final.
Despite being a former Copa Libertadores winner, Colombian side Atlético Nacional were forced to withdraw after CONMEBOL had prohibited international matches in Colombia in 1990 following allegations that a referee was threatened by six gunmen on the occasion of a match between Atlético Nacional and Vasco da Gama during the 1990 Copa Libertadores quarter-finals.
The matches were played from 18 October to 8 November. Teams from the same nation could not be drawn against one another. Boca Juniors, as the title holders, entered the competition at the quarter-finals.|}
The matches were played from 14 to 21 November.|-| style="text-align: center;" colspan="3"|
Estudiantes| style="text-align: center;" colspan="2"|Bye|}
The matches were played from 28 November to 10 December.|}
See main article: 1990 Supercopa Libertadores Finals. |}