There is a lack of consensus on the conceptualization of mental health, with models emphasizing negative aspects, positive aspects, or both. The models are mainly theory-based and may not fit in with the population’s opinions. The aim of this ongoing study is to investigate the conceptualizations of mental health in Europe from psychology, science, and engineering students’ perspectives in an explorative way through semi-structured interviews. Their conceptualizations of mental health are investigated qualitatively by thematic analysis to compare seven European countries. Results can be used to improve mental health questionnaires and interventions across Europe by enhancing the fit with students’ conceptualizations.