The aim of the present study is to examine the mediating effect of subjective vitality on the relationship between friendship quality and subjective happiness. Participants were 271 university students who completed a questionnaire package that included the Friendship Quality Scale, the Subjective Vitality Scale, and the Subjective Happiness Scale. According to the results, both subjective happiness and subjective vitality were predicted positively by friendship quality. On the other hand, subjective happiness was predicted positively by subjective vitality. In addition, subjective vitality mediated on the relationship between friendship quality and subjective happiness. The results were discussed in the light of the related literature and dependent recommendations to the area were given.