This chapter discusses the impact of international politics on the rise of populist parties as well as the impact of populism on the foreign policy of the countries in which populist parties are present. It argues that the end of the Cold War, the advent of globalization, and the impact of regional organizations (e.g. the European Union) presented opportunity structures that facilitated the rise of populist parties. Similarly, the chapter argues that the effect of populist parties on their countries’ foreign policy is largely due to their attaching ideology. The chapter thus distinguishes between four types of populist parties, each attaching salience to different foreign policy issues: the populist radical right, the populist market liberal, the populist regionalist, and the populist left.