The present proposal is relevant to the organization of the 34th edition of European Union Contest for Young Scientists, EUCYS, to be held in Brussels, Belgium, in September 2023. Since 1989, EUCYS has been organised in countries across Europe with the aim of promoting science and research in different countries and bringing research and young talents into spotlight in these countries. The young scientists also have the chance to meet others with similar abilities and interests and to be guided by some of the most prominent scientists in Europe. This way EUCYS seeks to strengthen the efforts made in each participating country to attract young people to careers in science and technology. The Jeunesses Scientifiques de Belgique (JSB), the Belgian EUCYS national organiser, shall host EUCYS 2023 and be responsible for the organisation of the event. JSB objective is to take on the great opportunity to welcome the European brightest young scientists in Europe; the organising committee has built a large experience hosting for 37 years the Belgian national Expo-Sciences, EUCYS 2016, the MILSET Expo-Sciences Europe 2000 and the MILSET Expo-Sciences international 2015 (ESI2015) – event that brought together 1000 participants from 60 different countries-. It will be a unique opportunity to welcome this prestigious event in Brussels, the European Capital and to interact with all European dimension of the host city and region. By activating JSB large network of schools, professors and students and as well promoting the vent within the European institutions, EUCYS will contribute to greatly enlarge the impact and visibility of the EU science promotion.