The 1979 Copa Libertadores represented the 20th edition of the tournament, which saw Olimpia of Paraguay win the title for the first time. They defeated the defending champions, Boca Juniors of Argentina. Olimpia's title was the first instance of a team from a country other than Uruguay, Argentina or Brazil winning Copa Libertadores. This allowed the Paraguayan side to play the Intercontinental Cup against Malmö FF of Sweden, in which the South American side won.
The champions and runners-up of each football association were drawn into the same group along with another football association's participating teams. Three clubs from Argentina competed as Boca Juniors was champion of the 1978 Copa Libertadores. They entered the tournament in the Semifinals.