Purpose This review focuses and aids the development of organizational support theory, which explains relationships between employers and employees based on social exchange. Many studies have explored the theory's central construct, perceived organizational support (POS), or the degree to which employees believe their work organization values their contributions and cares about their well-being. Since the last review of POS literature in 2000, the occupational landscape has shifted, increasing nontraditional work relationships and the importance of managing an international workforce while considering influences on employee well-being. This review discusses how the recent POS research reflects these trends. Design/Methodology/Approach This review focused on how themes in the POS research since 2000 have enhanced organizational support theory as relevant to the twenty-first century world of work. Findings Four important theoretical themes have developed since 2000 that enhance organizational support theory: considerations of employee well-being, nontraditional workers, international and cross-cultural issues, and developments tied to the use of multilevel modeling.Implications Giving both researchers and practitioners a synthesized view of the current status of POS research, this review serves as a springboard for new developments. It also integrates the multitude of recent studies into organizational support theory, focusing theoretical progress. Originality/Value This is the first review and theoretical integration of the POS literature since 2002. It is a valuable resource for all interested in the field, with theoretical insights, useful tables, explanatory figures, and references.