This chapter explores how the capability approach can enhance social work research and practice, particularly in relation to international cooperation that advocates for the social rights of undocumented immigrants. The capability approach focuses on the external opportunities available to individuals, enabling them to make choices and lead meaningful lives. It highlights how some are deprived of essential opportunities and resources, while the privileged few benefit from economic and political power. The chapter shifts focus from an individual to the implementation of policies in a globalized world, addressing how systemic exploitation is maintained. It also examines the challenges social work faces in positioning itself within restrictive immigration frameworks and calls for continuous reflection on social work’s position, values, and goals. It encourages international social work to strengthen its unified efforts in advocating for the rights and dignity of all individuals while critically challenging the structures that perpetuate inequality. Ultimately, this chapter contributes to more equitable and decolonized approaches for social work in addressing the issues posed by undocumented migration. It concludes that, when applied in collaboration with the field and with careful attention to power dynamics, the capability approach can significantly strengthen social work’s role in addressing systemic global injustices.