In this study, the mediating role of fear of happiness in the relationship between depression levels and rumination levels of university students was examined. The dependent variable of this study is depression, the mediating variable is fear of happiness and the independent variable is rumination. The research was conducted using the relational survey method. The sample consisted of university students studying at Selçuk University in the 2021-2022 and 2022-2023 academic year. Of the participants, 83.8% (290) were female and 16.2% (56) were male. In the study, bootstrapping method was used to test the significance of the indirect effect. It was observed that fear of happiness had a partial mediating role between depression and rumination levels in university students. From this point of view, it can be said that rumination and fear of happiness will increase depression in university students. At the same time, it can be said that rumination affects depression.