The third edition of the EU Datathon has been officially launched on 28 January 2019 by the Publications Office of the European Union. Participants are invited to develop apps and interactive visualisations offering new services or public information insights to citizens, public authorities and businesses. They have to use at least one dataset made available by the EU Institutions, Agencies and other bodes and combine it with at least one dataset of the competition’s partners. The participating teams can compete with their apps in one horizontal or two thematic challenges: