In the winter of 2019, a new clinic for medical treatment of undocumented immigrants opened in Odense, Denmark. The clinic is the third of its kind in Denmark, and the opening led to renewed debates on the extent of our ethical obligations to treat undocumented immigrants. Whose obligation is it, and why is it so? In this article, we will take a look at different ethical theories in order to unfold, analyse and enlighten some of the arguments in the debate. We discuss ethical guidelines such as the Hippocratic oath and international human rights. Further, we discuss the ethics of proximity in opposition to Jan Narveson’s theory of rational self-interest as well as ethical and juridical consequential views on whether, to what extent and where to treat non-emergency medical issues among undocumented immigrants.