IOM wields power over individuals and is capable of violating their rights, for instance when it contributes to migrant detention operations or when it engages in migrant returns that are ‘voluntary under compulsion’. This chapter assesses IOM’s legal human rights accountability in three steps. First, IOM’s human rights obligations are identified. While there has been much debate about their proper source, there is today little doubt that organizations such as IOM as have at least a core bundle of human rights obligations. The second step is to identify and analyze the mechanisms that may potentially hold IOM to account for violations of its human rights obligations. I identify the Office of the Inspector General and domestic courts as the only two IOM human rights accountability mechanisms, and analyze their rules on access, participation, neutrality, and outcomes using doctrinal legal methodology. Third, I assess the sufficiency of these two accountability mechanisms, in light of the right to an effective remedy and procedural justice research. The chapter concludes with an overall assessment of IOM’s human rights accountability, and some thoughts on potential avenues for reform.