Understanding the role of labor market institutions is a difficult but key task. Good institutions can alleviate the adverse effects of the many imperfections that characterize labor markets. But, unfortunately, bad institutions can, and often do, make things worse. The course will examine a range of institutions that affect the behavior of workers and employers in imperfect labor markets, and thus touch upon a number of important issues in labor economics: minimum wages, employment protection legislation, unemployment benefits, active labor market policies, collective bargaining, early retirement programs, education and migration policies, payroll taxes, and employment-conditional incentives. In order to characterize the effects of these institutions, the course relies on simple yet state-of-the-art theory and reviews corresponding evidence.