Recent research demonstrates that the quality of public institutions are crucial for a number of important environmental, social, economic, and political outcomes, and thereby human well-being. The Quality of Government (QoG) approach directs attention to issues such as impartiality in theexercise of public power, professionalism in public service delivery, effective measures against corruption, and meritocracy instead of patronage and nepotism in the hiring of public sector employees.This handbook offer a comprehensive, state of the art overview of this rapidly expanding research field and also identifies viable avenues for future research. The initial chapters focus on theoretical approaches and debates, and the central question of how QoG can be measured. The remainingchapters examine the wealth of empirical research on how QoG relates to democratization, social cohesion, ethnic diversity, human wellbeing, democratic accountability, economic growth, political legitimacy, environmental sustainability, gender quality, and the outbreak of civil conflicts. Thesechapters bring evidence to bear to examine, for example, questions of the effect of QoG on subjective well-being (i.e. happiness), social trust and inequality. A third set of chapters turns to the perennial issue of which contextual factors and policy approaches, both national, local andinternational, have proven successful (and not so successful) for increasing QoG.The Quality of Government approach both challenges and complements important strands of inquiry in the social sciences. For research about democratization, QoG adds the importance of taking state capacity into account. For economics, the QoG approach shows that in order to produce economicprosperity, markets need to be embedded in institutions with a certain set of qualities. For development studies, QoG emphasizes that issues about corruption are integral to understanding development writ large.