In the last ten years, the humanitarian crisis affected the Rohingya Ethnic in Myanmar has increasingly attracted the attention of the globe. The attention come either from the regional community or international community including United Nations. The humanitarian crisis become massive in scale and based on the UN findings fact report that there has been etnich cleansing or genocide practical in Rakhine State Myanmar. Those it carried out by the Myanmar military. Some recommendations have been delivered by special envoys from both the United Nations and ASEAN including some official reports from NGOs and UNCT that have been carrying out humanitarian mission tasks in Myanmar as well as Bangladesh, but in fact no solution yet achieved till today crisis. Through an international customary law approach as well as UN Charter mandate for a cooperation of regional organizations, also by referring to the doctrine of responsibility to protect this paper try to see whether ASEAN can be a mediator for conflict in Myanmar. This research was carried out by using research methods, literature study, personal participation and qualitative methods. From the observations, this paper to conclude providing an understanding to doctrine, theory and international law, the involvement of ASEAN can be the most probably as the best option for resolving conflicts in Myanmar."