The concept of war crimes, historical background, its elements, various types, recent trends and its difference with war has been analyze in this article. Apart from this in the second chapter the researcher has briefly presented the different war crime trials, such as Nuremberg Trial, Tokyo Trial, etc. Next Chapter deals with the tribunals established by Security Council. This chapter also describes the various conflicts which lead to the establishment of such tribunals. Furthermore, the role and jurisdiction of International Criminal Tribunal for the former Yugoslavia, International Criminal Tribunal for Rwanda, Special Courts & Tribunals and International Criminal Court is also presented in this Article.