This research project aimed to identify inspiring practices of citizen participation in science in Spain. In addition to analysing the current situation, the project aimed to raise awareness of these practices and to promote citizen participation in the Spanish science and technology system. Throughout the study, citizen participation has been understood as the active involvement (opinion, data collection, interpretation of results, decision-making...) of individuals or social groups in different phases of a scientific research process. The citizen participation activity must respond to or be included in the objectives of a research project.