Hobér, Kaj Keywords: Res iudicata | Concurrent proceedings | Law of civil procedure | Arbitration | International commercial arbitration | Private international law | Mots clefs: ABSTRACT The objective of these lectures is to identify situations where res judicata and lis pendens issues may arise in international arbitrations, as well as to take stock of, and to discuss, what arbitral tribunals actually do with respect to the principles of res judicata and lis pendens. After an introduction, the Chapter II discusses res judicata and lis pendens in a number of national jurisdicti…