The issues of coexistence has been regarded one of the most important question in which Mosul needs it after defeated the so called "Islamic State" or ISIS. Therefore, addressing of coexistence's requirements and clarifying the importance of these requirements, as well as, shed light on problems and obstacles which undermine coexistence in Mosul, its importance will turn out by conclusions in which focused on Mosul's need to build a new attempt to living together that will benefit from its historical experience and trying to overcome the effects of war that it has witnessed.