This course provides an introduction to the mainstream International Relations theories. The course mainly consisted of two parts. The first part of the course will explore the central assumptions and key concepts of the major theories of international relations. These theories include Classical Realism, Structural Realism, Liberalism, Neoliberalism, The English School, and Poststructuralism, Feminism, and Green Theory. The second part of the course will be based on students’ presentations on particular topics regarding the theories of international relations.