This publication aims to fill a significant knowledge gap on the human rights of irregular migrants. It seeks to describe barriers faced by irregular migrants in the exercise of such fundamental rights as the right to health, to education, to an adequate standard of living, to social security, and to just and favourable conditions of work, as well as trends and national policies, highlighting where possible examples of promising practice from around the world. It also draws attention to the guidance provided by international human rights law as well as related legal frameworks such as international labour law, and provides key messages on a human rights-based response to irregular migration.