Agency is a self-employed intermediary that serves with continuing authority to negotiate and conclude such transactions on behalf of and in the name of its client. A special commercial relationship also arises between the agency and the client that it represents for the purpose of continuity and gaining a profession. The agency’s authority to represent its client in court, which is regulated in Article 105/2-3 of the Turkish Commercial Code (TCC), is also an appearance of this special relationship. Pursuant to Article 105/II of the TCC titled “The Authorities of the Agency”, an agency is entitled to file a lawsuit on behalf of the client and to be a party to the lawsuits filed against the client due to the disputes arising from the contracts he has concluded or mediated that concerning client’s business. In addition, it is stipulated that the conditions contrary to this rule included in the contracts about those acting as an agent on behalf of foreign merchants will be invalid. In case the client is a foreigner, the evaluation of some issues related to the agency’s authority of representation in the case is the subject of our study.