One of the chief international security issues of today is humanitarian militaryintervention. In light of this, some questions have been raised about when and howoutsiders should get involved or if they are morally right at all to engage in humanitariancrises. In this paper Syria is the chosen case study because of its brutal crackdown and amassive human rights violation. The main purpose of this thesis is to understand themoral and legal criteria for launching a military intervention for humanitarian aid in Syriafollowed by a detailed analysis of its ethical, normative and legal issues. The maintheoretical framework of this study is just war theory. This study utilizes the criteria ofJus ad bellum principles, namely ‘legitimate authority’, ‘just cause’ and ‘right intention’in order to asses the extent to which Syria fits into the framework of just war theory. Thispaper also applies legal criteria such as the Charter of United Nations and internationallaw for the purpose of legal examination. The most complex issue in this thesis is the factthat although legitimate authority has the moral responsibilities to protect civilians, but itoften fails to uphold its responsibility mainly because of self-interest and the lack of rightintention.