Embassy buildings are the most tangible evidence of a state's diplomatic presence abroad. State authorities have invested in the architectural conception of purpose-built embassies to flex their diplomatic muscle and project nationhood on foreign soil. While scholars have primarily focused on purpose-built embassies of (former) world powers, Building for Belgium shifts the perspective by scrutinising the Belgian Ministry of Foreign Affairs' embassy-building programme from 1945 to 2020. Rather than a conventional political assessment of diplomatic relations, the book foregrounds the often-overlooked architectural lives of embassies and their social, economic, and political entanglements. By examining Belgian embassy projects across all continents, it reveals how Belgian diplomacy has navigated diverse political regimes, geopolitical contexts, cultures, and building codes. More than the outcome of a deliberate policy, the embassy-building programme has been shaped by incidental decisions, private ambitions and personal tastes of Belgian diplomats, ministry officials and politicians. Building for Belgium not only sheds light on diplomatic architecture but also connects domestic conversations about architecture in Belgium with global state-building projects. Offering fresh insights into the politics of space, it will be of value to scholars and practitioners in architecture, urban studies, international relations, cultural heritage, and Belgian and European studies.