The basic purpose of this study is to examine the mediating and moderating role of subjective vitality in relationship between rumination and subjective happiness. The participants were 420 university students. In this research, the Self-rumination Scale-SRS, the Subjective Vitality Scale and the Short Form of Oxford Happiness Questionnaire were used. The relationships between rumination, subjective vitality, and happiness were examined using correlation analysis and hierarchical regression analysis. In correlation analysis, happiness and subjective vitality were found negatively related to self-rumination. On the other hand, happiness had positive relation with subjective vitality. Hierarchical regression analysis showed that rumination levels in a decrease of subjective vitality on an unhappy person whereas enhances in subjective vitality leads to happiness; however, rumination also produces unhappiness. Results were debated in the light of the related literature.