The concept of Humanitarian Military Interventions has become a core issue within the international community since the 1990s. Human rights violations carried out on a massive scale are no longer perceived as purely domestic concerns but are now recognized as a central concern of the international community. This study of four cases of HMI -Somalia, Rwanda, Haiti and East Timor- is intended to shed the light on two political factors that play a determining role in HMI: the national interests of the interveners and the level of neutrality of the operations. I argue that the level of success of HMI is highly dependent on the presence of national interests in the region for the interveners and a low level of neutrality. This thesis also reflects on the ongoing challenges facing the international community regarding the most efficient ways to address massive human rights violations and presents suggestions towards addressing them.