Brazil has been a consistent troop contributor to United Nations (UN) peacekeeping operations (PKOs). Since the first participation, with the dispatch of an infantry battalion to Suez in 1957 to serve for 10 years in the United Nations Emergency Force I, the country has sent blue helmets to missions in Africa—notably in Mozambique and Angola—and Timor-Leste. More recently, Brazil provided the largest peacekeeping contingent to the UN Stabilisation Mission in Haiti and sent a warship to the UN maritime task force in Lebanon. However, although impressive at specific moments, these contributions have not occurred regularly and have shown a geographical concentration. In this context, this chapter investigates Brazil’s troop contributions to UN PKOs, focusing on the rationales at the political-strategic level. I argue that, in general, Brazil has successfully balanced universal and multilateral interests regarding peacekeeping and its own geopolitical interests. Moreover, the balance achieved and the few exceptions to attain it provide interesting lessons for consolidating the UN–member state peacekeeping partnership. This argument will be demonstrated by answering the following research questions: (1) What rationale does Brazil use for its troop contributions to UN peacekeeping operations? (2) To what extent does this rationale reconcile the universal and multilateral interests of the UN and Brazil itself with the country’s geopolitical vision? The topic will be explored through a focused review of Brazil’s past troop contributions to PKOs and an updated, critical analysis of the country’s reasons for joining these missions. Data will be drawn from the UN peacekeeping doctrine and policies, Brazil’s defence and security policy documents, and cutting-edge academic literature. The discussion will begin by exploring the UN’s universalist goals and multilateral interests regarding peacekeeping architecture and partnerships. They will then be confronted with Brazil’s constitutional principles and policies regulating troop contributions to the UN. Specific rationales for each participation in PKO will be analysed and evaluated, including the impact of the quest for a permanent seat in the UN Security Council. Ultimately, I will demonstrate that Brazil has been skilled in using its universalist foreign policy and geopolitical interests to support the UN’s peacekeeping intentions. However, selectivity and particular strategic priorities have worked against the complete reconciliation between the country’s and the world organisation’s interests. The study addresses the still little-explored field of justifications by UN member states for their participation in PKOs and contributes significantly to clarifying the dynamics of generating peacekeeping troops.