This chapter focuses on wellbeing and wellbeing promotion among soccer players from youth to the professional level. Within the general psychology literature, wellbeing is conceptualized as independent from, but related to, mental illness. As a result, psychological interventions can act to change levels of wellbeing, illbeing, or both. Two different philosophical perspectives on wellbeing dominate the literature, the hedonic and eudaimonic orientation views. The hedonic view adopts the label subjective or emotional wellbeing and considers it synonymously with pleasure and comfort. The eudaimonic perspective focuses on positive functionality and self-realization of individual talents. Organized sports, and particularly team sports, is an avenue where wellbeing among youths can be strengthened by use of mental health interventions. Most of the career transition research in soccer focuses on career termination, primarily at the elite or professional level. While soccer players face many challenges across their careers, times of transition are especially demanding on their mental health, particularly forced or unexpected retirement.