In this article, the set of institutions which embody the form and contents of the economic system of Islam is introduced. By institutions, it is meant the economic freedoms, the government, ownership, motivation, the mechanism for coordinating economic activities, power, organization and bureaucracy. After explaining Islam’s outlook regarding these institutions, the form and the contents of this system are introduced to some extent in a manner that its outcome is not rendered incompatible with the spirit that religion aims to establish on the pillars of the social system.