The purpose of this paper is to analyze recent developments in the protection of human rights of undocumented migrants and identify unresolved controversial issues in this field. In the current international situation, undocumented migrants continue clearly to face problems concerning their status and their rights, in particular, those who have entered the territory of the State illegally (illegal entrants) or have stayed illegally even if they initially entered legally (migrants who have stayed longer than the law or their permits allow). At the UN level, the tendency in the last twenty years has been towards a gradual development of a more precise framework regarding in particular the situation of migrant workers. Furthermore, regional bo...