The article aims to analyse the significance of liberal norms and values in the development of political relations between the EU and ASEAN, an issue which has been only selectively analysed in academic literature. At the same time, the topic of the article fits into a broader landscape of issues associated with the development of relations between international intergovernmental organisations in contemporary international relations, only partially studied in Polish and international literature to date. Considering the essential framework of classic constructivism, as well as significant contributions added by critical constructivism, the article formulates a research hypothesis whereby the European Union and ASEAN are organisations which, while recognising the importance of liberal values and norms, take a different approach to their promotion and protection. The European Union, which attempted to act towards ASEAN as an interpreter and diffuser of the aforementioned values and norms in the 1990s, adopted a pragmatic approach over time, in response to ASEAN’s stance and actions, limiting its role in this respect and taking regional conditions and dependencies into account. In order to verify this hypothesis, three research questions were formulated, namely: What is the place of liberal norms and values in the EU and ASEAN policy documents? Is the respect and protection of liberal norms and values an important element declared in mutual relations? How do both sides approach the implementation of liberal norms and values in practice in selected cases? This article is structured around these issues and discusses the significance of liberal norms and values in EU and ASEAN policy documents, the place and role of liberal norms and values in documents underpinning EUASEAN relations and in EU documents formulated towards ASEAN and the Southeast Asian region and also provides an analysis of EU and ASEAN policy towards Myanmar.