This paper intends to define and delimit the freedom of thinking and freedom of idea in Islam, emphasizing on Allameh Tabatabaee’s viewpoint and employing the technique of text-based, methodical interpretation data analysis through library referral to his works and pointing to freedom, its types and limits in Islam, its legitimacy and illegitimacy, and also the requirements of thinking freedom. To do so, after enumerating anthropological and ontological bases and defining the limits of freedom, the central topic of the paper, “the freedom of thinking” and “freedom of idea”, and their relationships and differences will be discussed, and finally this conclusion will be obtained that according to Allameh Tabatabaee, in Islam, the freedom of idea without pondering, is forbidden because it is opposed to freedom of thinking and is the origin of blind and causeless dogmatism, in spite of some recommendations represented in favor of it.
