Individuals who reside in a country without regular authorisation generally find it difficult to access public medical services beyond emergency treatment. Even in countries with universal healthcare, there is often a gap between rights on paper and their implementation. Civil society organisations (CSOs) fill this gap by providing medical services to vulnerable populations, including irregular migrants. What, if any, are the ethical dilemmas that arise for CSO staff when delivering such services in countries with universal healthcare? Under what conditions do these dilemmas arise?