In recent years, after reducing their reference interest rates at nearly 0%, most central banks designed a variety of novel monetary policy tools to fight recessions, including communication strategies, credit policies, and large-scale asset purchases. These new measures often referred to as “unconventional” monetary policies. The objective of this course is to provide participants with a thorough understanding of the state-of-the-art research on different types of unconventional policies, of their costs and benefits, and of their effects on financial and aggregate economic variables.