In comparison to state court proceedings, the confidentiality of arbitration is often regarded as one of the major advantages of this form of alternative dispute resolution. It is widely acknowledged that arbitrators and arbitral institutions are under a duty of confidentiality. Quite to the contrary, the question of whether the parties bear duties of confidentiality remains controversial. This uncertainty is caused by the lack of decisions and explicit legal provisions on this topic under Austrian Law. From that fact, however, one should not infer that no duty of confidentiality applies. Thus, the diploma thesis is primary dealing with the question whether the parties to an arbitration are under an implied duty of confidentiality, although there are no uniform views and approaches on this point. The author analyzes if such a duty of confidentiality is to be derived from an accessory obligation that arises out of the arbitration agreement, even where the parties have not explicitly agreed upon a duty of confidentiality. Due to the international relevance of arbitration, the diploma thesis further deals with non-Austrian legal provisions, opinions and case laws to perform a comparative analysis to Austria.