Summary. Dominance Under Article 82 of the EC Treaty and the Problems of Its Finding This study is devoted to the analysis of the conception of dominance in the European Community competition law. The objective of this study is to ascertain the main features of the aspects of dominance, including its finding problems. The analysis presents such types of dominance as single dominance, collective dominance and super-dominance. Particular attention is given to the research of the possible changes of the concept of dominance, subject to the process of modernization of application of Article 82 EC. It is concentrated to the practice of the European Community courts and the European Commission. However Lithuanian competition law, which regulates dominance, is also examined. Considering the undertaking to approximate Lithuanian national competition law to acquis communautaire of the European Union, the study labours for answering, whether the competition rules, established in Lithuania correspond to the European Community competition law in the light of dominance.