Comparative foreign policy analysis (CFP) is a vibrant and dynamic subfield of international relations. It examines foreign policy decision-making processes related to momentous events as well as patterns in day-to-day foreign interactions of nearly 200 different states (along with thousands of international and nongovernmental organizations). Scholars explore the causes of these behaviors as well as their implications by constructing, testing, and refining theories of foreign policy decision-making in comparative perspective. In turn, CFP also offers valuable lessons to government leaders. This essay surveys the evolution of CFP as a subfield over time, with special attention to its contributions to academic understanding and policy-makin...