Abstract
In spite of orientation of philosophy in the western philosophy after renaissance when the relation between religion and philosophy was weakened and broken, in the Islamic world in particular Iranian society the strong relation appeared between religion and philosophy. However this relationship alleviated diversity and audaciousness of philosophical thought, but it deepened and widened religious thoughts. In fact, entrance of philosophical discussions in the realm of religion causes the rational interpretation of religion and lessens fanaticism and dogmatism and it excludes superstition from religious thoughts. Philosophers like Averroes, Avicenna and Mulla Sadra have discussed the interaction of religion and philosophy. Islamic philosophy is completely an intellectual knowledgewhich differs from theology is based on revelatory texts. The title of Islamic philosophy displays the relationship between religion and philosophy.