This doctoral dissertation investigates the modes in which Haiti is invoked in Brazilian political discourse in different contexts. Drawing on post-colonial and Foucauldian frameworks of analysis, it focuses on two major emergences of such discursive practice: first, with the innovative lexicon of Haitianism, during 19th century Brazilian Imperial political debates; then, alongside Brazilian involvement with the United Nations Stabilization Mission in Haiti (MINUSTAH), from 2004 to 2017. The study shows that current narratives that celebrate a Brazilian way of peacebuilding fail to notice how problematic accounts of racial hierarchies and more efficient governmental technologies of power are developed and exercised upon target populations. It argues that through the prism of Haitianism such celebratory discourses regarding South-South military interventions lose their political appeal, as the coloniality and biopower that inform them are exposed and their originality questioned. It concludes by noticing that the study of Haitianism permits to further decolonize and resist the authority of emerging humanitarian power-knowledge complexes beyond the traditional Liberal Peace model.