This chapter reviews sustainability research published in the top ten public administration and policy journals during the past quarter-century. It focuses on the types of research questions that scholars ask, the research methodologies they use, and the theoretical developments that have emerged. The review reveals that while earlier sustainability discourse largely focused on the environment, social and economic sustainability research is becoming increasingly prominent. Several factors are driving this development: recent fiscal recessions that negatively affected the carrying capacity of public administration institutions; the expansion of the new public management paradigm and growing concerns about the sustainability of public services and the multi-sector organizations and networks that provide such services; the uneven effects of natural and human-made disasters on different population groups; and concerns about urban revitalization and growing social inequality in cities. The chapter concludes that researchers should adopt a more holistic approach to sustainability.