The evaluation of “The Giving for a Better World (GFBW)” intervention was reported. The project sought to develop indicators of student eudaimonic wellbeing and voluntary prosocial action. The effects of the GFBW mentorship intervention on Year 10 and Year 8 student eudaimonic wellbeing and voluntary prosocial action was evaluated. The findings show that it was feasible to assess student eudaimonic wellbeing and voluntary prosocial action and that the GFBW intervention had a positive effect on these constructs.