[2] The biggest success by Polish clubs in UEFA-administered competitions is reaching a semifinal in European Cup.
[3] Polish clubs were more successful in non-UEFA-administered Intertoto Cup.
Polonia Bytom won the 1964–65 edition followed by losing in the final next year.
Odra Opole and Zagłębie Sosnowiec reached semi-finals, each once.
Bold and italic denote the group winner (only 1967–1994 seasons).