The World Trade Organisation (WTO) serves as a forum for co-operation, currently for as many as 164 countries, and in addition, it allows for the resolution, also amicably, of trade conflicts between parties, consequently, settling disputes between them. One of essential provisions of the Uruguay Round (UR) of the General Agreement on Tariffs and Trade (GATT) included the introduction of a new dispute settlement mechanism, that is to say, the Dispute Settlement Understanding (DSU), which became effective on 1 January 1995. Member States of the European Union were not only actively involved in developing the rules of the international trade system, but they also influenced, to a large extent, the form of both such rules and of ongoing trade negotiations, as well as they assumed and still assume responsibility for the final arrangements. Hence, their role in the multilateral trade system is both active and passive. This paper aims to demonstrate the functioning of the WTO’s dispute settlement mechanism and show the role which the European Union serves in this system. The Article employs an analytical and descriptive method. It draws on sources from the national and international literature and WTO’s databases.