A handful of observers have suggested that volunteering can be defined and described as a leisure activity. Extending this reasoning, it is argued that many kinds of volunteering, because they foster the acquisition and expression of a combination of special skills, knowledge, and experience, can be looked on as serious leisure. The serious leisure perspective not only defines and explains volunteers and volunteering as self-interested leisure but also opens the way to a more comprehensive theoretical statement of leisure volunteering than was heretofore available. In this artick, the author explores the leisure components of all volunteering to learn where the serious leisure model applies. Distinctions are drawn between types of volunteering: career and casual, formal and informal, and occupational and nonoccupational. The perspective fails to fit each type equally well. It fits best the types of volunteering classifiable as formal and nonoccupational, types in which wlunteers normally find substantial leisure careers.