Frankfurt School’s critical theory, derived from the ideology of Herbert Marcuse and Jürgen Habermas et al. was put forward by Robert Cox, Andrew Linklater , and Marc Hoffmann into the realm of international relationships. It will be discussed in the framework of the third debate of international relationships. The concepts represented in this theory are highly similar to those in the Islamic theory within international policy and foreign policy. Thus, the question here is the degree to which these concepts can be employed in order to extend the Islamic theory of international relationships. The present paper is going to determine the degree to which such concepts as freedom, knowledge, mutual understanding, hegemony structure, international clampdown, and the like, which are frequently used in the Islamic international policy literature as the foundation of critical theory related to international peace, are comparable. The first hypothesis of this research is that above-mentioned concepts have only verbal similarities and not interchangeable in the level of ontology and epistemology. In order to explain the main concepts of critical theory, this research, sued analytical, descriptive method based on major resources employment. In fact, it answers the question utilizing the major resources being used in the Islamic international relationships literature.
