Forced labor was central to the modern history of the Portuguese empire. It was widely imposed across Angola, Mozambique, São Tomé, and Guinea after the imposition of Portuguese colonial rule in the late 19th century and persisted within the Portuguese empire for decades after it had been abolished by other European powers. The brutal violence and far-reaching social disruption created by forced labor had a profound impact on colonized communities. It was one of the most important ways that individual subjects interacted with the Portuguese colonial state. Forced labor was also fundamental in structuring the economic, political, social, and ideological contours of the Portuguese empire: the colonial economy was deeply dependent on the exploitation facilitated by forced labor, and both the operations of the Portuguese colonial administration and the justification for its existence were closely intertwined with conscripting forced workers. Finally, the prevalence of forced labor in the Portuguese empire precipitated recurring international scandals, which did a great deal to define Portuguese colonialism in the eyes of the world. Studying forced labor has therefore become an important methodology for understanding the depredations of Portuguese colonial rule, its impact on the lives of the people it governed, and the economic and political organization of the Portuguese empire.