This dissertation presents an analytical study of the evolution of the right of political selfdetermination and the influence of the principle of non-interference on promotion of this right. The intellectual and legal interests in democracy, good governance and social justice have contributed to the development of this right and its realisation for peoples lacking the least degree of good governance. The right of political self-determination is strongly associated with international intervention because governments facing popular demands for this right often resort to repression and military means to suppress such claims. Such interventions have also been driven by contemporary interest in supporting collective rights through international organisations that monitor and identify violations of various political rights. Thus, this dissertation focuses on the tension between the principle of non-interference and the modern legal trend to promote the political rights of all peoples. This research contributes considerable insights into the transformation of the principle of non-interference from an absolute obligation into a flexible concept by tracing the contributing legal changes both in international practices and in emerging rules and principles in international law. It is concluded that the promotion of the right of self-determination has resulted in international practices that have dramatically influenced and caused tension with the principle of noninterference. Keywords: right of political self-determination, democracy, statehood, the principle of noninterference, international intervention, sovereignty.