The term Nongovernmental Organization or NGO, sometimes describes groups, although it more perfectly back to a unit in the domestic field. The abovementioned term, came into prevalence in the 1945, because of the necessity for the UN to creation of the separateness in its charter between    participation    rights    for    its    intergovernmental    specialized agencies and also for the active international private organizations.

This research elucidates that INGOs have an active roles in international arena. Their roles are in different fields of humanitarian, social, cultural, economical, peace and so on. We have explained the roles of three chosen organizations (Amnesty International, Green Peace, Red Cross and Red Crescent) in details along with a precise exploration on their effects on peace keeping, peacemaking and prevention of war.

Everywhere we have felt the necessity of more explanation and more focus; we have drawn the tables or charts. The important point here is the divisions of our chapters according to our main questions. On the other words, we have answered to our questions in details in the frame of various chapters.