The paper reviews literature on perception within the international relations and the European Union (EU) studies in order to find out whether and how this concept can help us shed some light on the mutual relations between the EU member states. It examines the utilisation of perception as an analytical tool within the international relations where it was predominantly included into the foreign policy analysis approaches (image and role theory). Moreover, it was used for examining the views of the EU by other actors at not only bilateral but also multilateral level. Most studies analysed the perception of Asian countries, however, other areas, including Africa, were studied. Perception was utilised also at the EU level, when it was used for scrutinising different EU policies (foreign and security policies, enlargement), examining preference formation and influence of member states or investigating elite and public support for the European integration. The results show that perception is a valuable concept that can help us to analyse mutual relations between the EU member states in the enlarged and changed EU in several ways.