This paper focuses on the judicial dialogue as a device of harmonization and rapprochement among legal systems. The author looks at significant case-studies highlighting different attitudes toward foreign law: the US Supreme Court’s “isolationist” approach is compared with the Canadian Supreme Court’s “dialogical” one. Attention is also given to the South-African instance, as a clear example of cultural “openness” toward external legal factors. In sum, the dialogue among courts is a powerful factor working for legal globalization.