The intersection between Colombian business association law and private international law is dealt with in this chapter. For this purpose, it identifies the current issues in the international interaction of for-profit entities and their shareholders or partners, studying the former under a double angle or edge: both as juridical persons, and therefore subjects of rights and duties, and international contracts. This entails analyzing the legal rules determining which companies are domestic and foreign and the legal relevance of such a distinction. The chapter also makes some comments on the IADIP Draft General Act on Private International Act for Colombia regarding business association law.