This chapter examines the use of discourse analysis in the study of foreign policy. In the study of international relations, discourse analysis is associated with post-structuralism, a theoretical approach that shares realism’s concern with states and power, but differs from realism’s assumption that states are driven by self-interest. It also takes a wider view of power than realists normally do. Post-structuralism draws upon, but also challenges, realism’s three core assumptions: groupism, egoism, and power-centrism. The chapter first considers the theoretical principles that inform post-structuralist discourse analysis before discussing the research designs and methodological techniques employed by discourse analysts. It also offers examples and four learning boxes featuring mini-case studies and locates poststructuralist discourse analysis within the field of foreign policy analysis. Finally, it assesses the strengths and weaknesses of post-structuralist discourse analysis.