The 1970 Copa Libertadores de América was the 11th edition of CONMEBOL's top Association football club tournament.

Estudiantes successfully defended their title for the second straight year by defeating Peñarol in the finals.

Teams from Brazil did not participate in this year's tournament due to CBF still disagreeing with the format.

Three clubs from Argentina competed as Estudiantes were the champions of the 1969 Copa Libertadores.

If after two games, no one team had the most points, a single-game playoff was to be played on neutral grounds to determine who advanced (or wins as is the case for the finals).