This paper reports on tests of relationships between participation in organized sport as a youth and earned income in adulthood. The data are drawn from a sample survey of adult Canadians. The results, both before and after appropriate controls, show that those who participated in organized sport as a youth tended to have higher annual earned incomes as adults than those who did not participate in this way. The relationships are stronger and more consistent for males than females across social subgroups defined by education level completed. Further supplemental analyses compare the explanatory import of youth sport participation and other forms of voluntary community involvement as a youth. Also presented are interpretations of the results, which emphasize the “cultural and social capital” and “physical capital” outcomes of involvement in youth sport activity.