This article applies Registration Regime Theory (RRT) to the historical institution of transatlantic slavery in order to examine how systems of registration functioned as mechanisms of human commodification, legal fixation, and ontological transformation. While slavery is often analyzed primarily through violence, economic exploitation, or racial ideology, this study argues that bureaucratic and archival infrastructures played a decisive role in stabilizing and reproducing enslaved status across generations. Through ship manifests, plantation ledgers, property registries, birth records, and legal documentation, enslaved individuals were transformed into legally recognized commodities. These registration systems did not merely record ownership; they produced it. By inscribing human beings into administrative categories of property, colonial states and economic institutions converted biological life into transferable capital. The article further demonstrates how the hereditary transmission of enslaved status depended on the continuity of archival inscription. Registration functioned as a mechanism of social fixation, ensuring that enslavement persisted beyond individual lifetimes and became structurally embedded within legal and economic systems. Finally, the study draws a comparative connection between historical slavery and contemporary forms of forced labor, including migrant labor regimes, debt bondage, and state-administered coercive labor systems. In these modern contexts, digital documentation, biometric identification, and contractual registration operate as updated forms of the same underlying logic: the transformation of laboring bodies into administratively controlled assets. By reframing slavery through the lens of registration power, this article contributes to broader debates on sovereignty, bureaucracy, and the political ontology of legal recognition. It argues that domination is sustained not only through coercion, but through the administrative production of social reality.